Example showing datastore create with CLI inlined credential

## What example? Describe it

example: az ml datastore create -f ds.yml --set credentials.*=
description: A datastore creation without inline YML credentials

## Additional context
More examples of datastore create flow
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Locate the existing Azure ML datastore creation examples and the `az ml datastore create -f ds.yml --set credentials.*=` flow. Add an example showing datastore creation without inline YAML credentials, then verify that the documented command and `ds.yml` configuration match the requested flow.

Written by the indexing model from the issue text.