chore(docs): add missing image updater command flags

docs/install/cmd/completion.md

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+## Synopsis
+
+`argocd-image-updater completion [command] [flags]`
+
+## Description
+
+Generates the autocompletion script for argocd-image-updater for the specified shell.
+See each sub-command's help for details on how to use the generated script.
+
+## Flags
+
+**-h, --help**
+
+Help for completion
+
+## Sub-Command bash
+
+### Synopsis
+
+`argocd-image-updater completion bash [flags]`
+
+### Description
+
+Generate the autocompletion script for the bash shell.
+
+This script depends on the 'bash-completion' package.
+If it is not installed already, you can install it via your OS's package manager.
+
+To load completions in your current shell session:
+
+	source <(argocd-image-updater completion bash)
+
+To load completions for every new session, execute once:
+
+**Linux**
+
+	argocd-image-updater completion bash > /etc/bash_completion.d/argocd-image-updater
+
+**macOS**
+
+	argocd-image-updater completion bash > $(brew --prefix)/etc/bash_completion.d/argocd-image-updater
+
+You will need to start a new shell for this setup to take effect.
+
+### Flags
+
+**-h, --help**
+
+Help for bash.
+
+**--no-descriptions**
+
+Disable completion descriptions.
+
+## Sub-Command fish
+
+### Synopsis
+
+`argocd-image-updater completion fish [flags]`
+
+### Description
+
+Generate the autocompletion script for the fish shell.
+
+To load completions in your current shell session:
+
+	argocd-image-updater completion fish | source
+
+To load completions for every new session, execute once:
+
+	argocd-image-updater completion fish > ~/.config/fish/completions/argocd-image-updater.fish
+
+You will need to start a new shell for this setup to take effect.
+
+### Flags
+
+**-h, --help**
+
+Help for fish.
+
+**--no-descriptions**
+
+Disable completion descriptions.
+
+## Sub-Command powershell
+
+### Synopsis
+
+`argocd-image-updater completion powershell [flags]`
+
+### Description
+
+Generate the autocompletion script for powershell.
+
+To load completions in your current shell session:
+
+	argocd-image-updater completion powershell | Out-String | Invoke-Expression
+
+To load completions for every new session, add the output of the above command
+to your powershell profile.
+
+### Flags
+
+**-h, --help**
+
+Help for powershell
+
+**--no-descriptions**
+
+Disable completion descriptions
+
+## Sub-Command zsh
+
+### Synopsis
+
+argocd-image-updater completion zsh [flags]
+
+### Description
+
+Generate the autocompletion script for the zsh shell.
+
+If shell completion is not already enabled in your environment you will need
+to enable it.  You can execute the following once:
+
+	echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+To load completions in your current shell session:
+
+	source <(argocd-image-updater completion zsh)
+
+To load completions for every new session, execute once:
+
+**Linux:**
+
+	argocd-image-updater completion zsh > "${fpath[1]}/_argocd-image-updater"
+
+**macOS:**
+
+	argocd-image-updater completion zsh > $(brew --prefix)/share/zsh/site-functions/_argocd-image-updater
+
+You will need to start a new shell for this setup to take effect.
+
+### Flags
+
+**-h, --help**
+
+help for zsh
+
+**--no-descriptions**
+
+disable completion descriptions

docs/install/cmd/help.md

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+## Synopsis
+
+`argocd-image-updater help`
+
+## Description
+
+Displays help message.
+
+## Flags
+
+**-h, --help**
+
+Help for completion.

docs/install/cmd/run.md

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+## Command "run"
+
+### Synopsis
+
+`argocd-image-updater run [flags]`
+
+### Description
+
+Runs the Argo CD Image Updater, possibly in an endless loop with a set of options. 
+
+### Flags
+
+**--application-namespace *namespace***
+
+Specifies the Kubernetes namespace in which Argo CD Image Updater will manage Argo CD Applications when using the Kubernetes-based Application API. By default, applications in all namespaces are considered. This flag can be used to limit scope to a single namespace for performance, security, or organizational reasons.
+
+**--applications-api *api kind***
+
+API kind that is used to manage Argo CD applications ('kubernetes' or 'argocd') (default "kubernetes")
+
+Can also be set using the *APPLICATIONS_API* environment variable.
+
+**--argocd-auth-token *token***
+
+Use *token* for authenticating to the Argo CD API. This token must be a base64
+encoded JWT, as generated by Argo CD.
+
+The token can also be set using the *ARGOCD_TOKEN* environment variable.
+
+**--argocd-grpc-web**
+
+If this flag is given, use the gRPC-web protocol to connect to the Argo CD API.
+This can be useful if your Argo CD API is behind a proxy that does not support
+HTTP/2, or only accept HTTP/2 on the front end.
+
+Can also be set using the *ARGOCD_GRPC_WEB* environment variable.
+
+**--argocd-insecure**
+
+If specified, the certificate of the Argo CD API server is not verified. Useful
+if you are using a self-signed TLS certificate for the Argo CD API server. As
+the name implies, this is an *insecure* setting and should not be used for
+production systems.
+
+Can also be set using the *ARGOCD_INSECURE* environment variable.
+
+**-argocd-namespace *namespace***
+
+namespace where ArgoCD runs in (current namespace by default)
+
+**--argocd-plaintext**
+
+If specified, use an unencrypted HTTP connection to the ArgoCD API instead of
+TLS.
+
+Can also be set using the *ARGOCD_PLAINTEXT* environment variable.
+
+**--argocd-server-addr *server address***
+
+Connect to the Argo CD API server at *server address*. *server address* must
+be a valid IP address or DNS host name, optionally with a port specification
+delimited using a colon, i.e. *10.23.42.5* or *argocd-server.argocd:8080*.
+If no port given, the protocol default will be used: Port 80 for plaintext
+connections, and port 443 for TLS connections.
+
+Can also be set using the *ARGOCD_SERVER* environment variable.
+
+**--disable-kube-events**
+
+Disable kubernetes events
+
+Can also be set with the *IMAGE_UPDATER_KUBE_EVENTS* environment variable.
+
+**--disable-kubernetes**
+
+If running locally, and you do not have a working connection to any Kubernetes
+cluster, this flag will prevent Argo CD Image Updater from creating a client
+to interact with Kubernetes. When Kubernetes access is disabled, pull secrets
+for images can only be specified from an environment variable.
+
+**--dry-run**
+
+If this flag is set, Argo CD Image Updater won't actually perform any changes
+to workloads it found in need for upgrade.
+
+**--git-commit-email *email***
+
+E-Mail address to use for Git commits (default "[email protected]")
+
+Can also be set using the *GIT_COMMIT_EMAIL* environment variable.
+
+**--git-commit-message-path *path*** 
+
+Path to a template to use for Git commit messages (default "/app/config/commit.template")
+
+**--git-commit-sign-off**
+
+Whether to sign-off git commits
+
+**--git-commit-signing-key *key***
+
+GnuPG key ID or path to Private SSH Key used to sign the commits
+
+Can also be set using the *GIT_COMMIT_SIGNING_KEY* environment variable. 
+
+**--git-commit-signing-method *method*** 
+
+Method used to sign Git commits ('openpgp' or 'ssh') (default "openpgp")
+
+Can also be set using the *GIT_COMMIT_SIGNING_METHOD* environment variable.
+
+**--git-commit-user *user***
+
+Username to use for Git commits (default "argocd-image-updater")
+
+Can also be set using the *GIT_COMMIT_USER* environment variable.
+
+**--health-port *port***
+
+Specifies the local port to bind the health server to. The health server is
+used to provide health and readiness probes when running as K8s workload.
+Use value *0* for *port* to disable launching the health server.
+
+**-h, --help**
+
+help for run
+
+**--interval *duration***
+
+Sets the interval for checking whether there are new images available to
+*duration*. *duration* must be given as a valid duration identifier with
+a unit suffix, i.e. `2m` for 2 minutes or `30s` for 30 seconds. If no unit
+is given, milliseconds will be assumed. If set to `0`, ArgoCD Image Updater
+will exit after the first run, effectively disabling the interval. Default
+value is `2m0s`.
+
+Can also be set using the *IMAGE_UPDATER_INTERVAL* environment variable.
+The `--interval` flag takes precedence over the `IMAGE_UPDATER_INTERVAL` environment variable.
+
+The order of precedence for determining the update interval is as follows:
+
+1.  **`--interval` flag:** If the `--interval` command-line flag is provided, its value will be used.
+2.  **`IMAGE_UPDATER_INTERVAL` environment variable:** If the `--interval` flag is not set, the value of the `IMAGE_UPDATER_INTERVAL` environment variable will be used.
+3.  **Default value:** If neither the `--interval` flag nor the `IMAGE_UPDATER_INTERVAL` environment variable is set, the default value will be used.
+
+**--kubeconfig *path***
+
+Specify the Kubernetes client config file to use when running outside a
+Kubernetes cluster, i.e. `~/.kube/config`. When specified, Argo CD Image
+Updater will use the currently active context in the configuration to connect
+to the Kubernetes cluster.
+
+**--loglevel *level***
+
+Set the log level to *level*, where *level* can be one of `trace`, `debug`,
+`info`, `warn` or `error`.
+
+Can also be set using the *IMAGE_UPDATER_LOGLEVEL* environment variable.
+
+**--match-application-label *selector***
+
+Only process applications that have a valid annotation and match the given
+*label* selector. The *selector* is a string that matches the standard kubernetes
+[label selector syntax][]. For e.g., `custom.label/name=xyz` would be a valid label
+that can be supplied through this parameter. Any applications carrying this
+exact label will be considered as candidates for image updates. This parameter
+currently does not support pattern matching on label values (e.g `customer.label/name=*-staging`).
+You can specify equality, inequality, or set based requirements or a combination.
+For e.g., `app,app!=foo,custom.label/name=xyz,customer in (a,b,c)`
+
+**--match-application-name *pattern***
+
+Only process applications that have a valid annotation and matches the given
+*pattern*. The *pattern* is a simple glob pattern and supports file system
+style wildcards, i.e. `*-staging` would match any application name with a
+suffix of `-staging`. Can be specified multiple times to define more than
+one pattern, from which at least one has to match.
+
+**--max-concurrency *number***
+
+Process a maximum of *number* applications concurrently. To disable concurrent
+application processing, specify a number of `1`.
+
+**--metrics-port *port***
+
+port to start the metrics server on, 0 to disable (default 8081)
+
+**--once**
+
+A shortcut for specifying `--interval 0 --health-port 0`. If given,
+Argo CD Image Updater will exit after the first update cycle.
+
+**--registries-conf-path *path***
+
+Load the registry configuration from file at *path*. Defaults to the path
+`/app/config/registries.conf`. If no configuration should be loaded, and the
+default configuration should be used instead, specify the empty string, i.e.
+`--registries-conf-path=""`.
+
+**--warmup-cache**
+
+whether to perform a cache warm-up on startup (default true)
+
+[label selector syntax]: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors

docs/install/cmd/template.md

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+## Synopsis
+
+`argocd-image-updater template [<PATH>] [flags]
+
+## Description
+
+The template command lets you validate your commit message template. It will
+parse the template at given PATH and execute it with a defined set of changes
+so that you can see how it looks like when being templated by Image Updater.
+
+If PATH is not given, will show you the default message that is used.
+
+## Flags 
+
+**-h, --help**
+
+Help for template.