{Azure Bastion} documentation fix and update preview flag

[aavalang]

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This checklist is used to make sure that common guidelines for a pull request are followed.

Related command

General Guidelines

• [x] Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• [x] Have you run python scripts/ci/test_index.py -q locally? (pip install wheel==0.30.0 required)
• [ ] My extension version conforms to the Extension version schema

For new extensions:

• [x] My extension description/summary conforms to the Extension Summary Guidelines.

About Extension Publish

There is a pipeline to automatically build, upload and publish extension wheels.
Once your pull request is merged into main branch, a new pull request will be created to update src/index.json automatically.
You only need to update the version information in file setup.py and historical information in file HISTORY.rst in your PR but do not modify src/index.json.

[azure-client-tools-bot-prd[bot]]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd[bot]]

Hi @aavalang, Please write the description of changes which can be perceived by customers into HISTORY.rst. If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

Azure Bastion

[github-actions[bot]]

For more info about extension versioning, please refer to Extension version schema