Explenations differ a bit

- If the issue is to do with Azure CLI 2.0 in-particular, create an issue here at [Azure/azure-cli](https://github.com/Azure/azure-cli/issues)

### Extension name (the extension in question)
az pipelines build tags []

### Description of issue (in as much detail as possible)
https://docs.microsoft.com/en-us/cli/azure/pipelines/build/tag?view=azure-cli-latest
https://docs.microsoft.com/en-us/cli/azure/ext/azure-devops/pipelines/build/tag?view=azure-cli-latest
--subscription is missing in the first link AND present in the second one?
-----

Also reported at the other link as #16136