fix: broken mock make target (#1336)

Author: wtrocki

CONTRIBUTING.md

@@ -87,7 +87,7 @@ To work and test CLI locally please follow the [mock readme](https://github.com/
 rhoas login --api-gateway=http://localhost:8000
 ```
 
-### `make mock-api/start`
+### `make start-mock-api`
 
 Starts the mock all services Manager API and Instance API at [`http://localhost:8000`](http://localhost:8000).
 

Makefile

@@ -71,7 +71,7 @@ generate-ams-sdk: ## Generate the Account Management Service SDK
 start-mock-api: ## Start the mock rhoas server
 	npm install -g @rhoas/api-mock
 	asapi --pre-seed
-.PHONY: mock-api/start
+.PHONY: start-mock-api
 
 format: ## Clean up code and dependencies
 	@go mod tidy