Update doc

Author: francoispluchino

doc/update-cloud-formation-stack.md

@@ -14,10 +14,18 @@ To finish the update, follow the wizard of the AWS console.
 You can also update your CloudFormation Stack of Tug with the latest version, just use the AWS console
 or AWS CLI tool to update the stack with the S3 link below:
 
+For the latest version:
+
 ```
 https://tug-dev.s3.amazonaws.com/latest.template
 ```
 
+For a specific version tag name available in the [Github Releases page](https://github.com/fxpio/tug/releases):
+
+```
+https://tug-dev.s3.amazonaws.com/<TAG_NAME>.template
+```
+
 > **Note:**
 > When updating the CloudFormation Stack, the Tug version is not automatically
 > updated given that it is a parameter of the Stack. So you must manually override