[AutoPR monitor/data-plane] Fix the swagger spec to ensure the documentaiton generation works as expected

[AutorestCI]

Created to sync Azure/azure-rest-api-specs#3911

[AutorestCI]

(message created by the CI based on PR content)

Installation instruction

Package azure-monitor

You can install the package azure-monitor of this PR using the following command:
pip install "git+https://github.com/Azure/azure-sdk-for-python@restapi_auto_3911#egg=azure-monitor&subdirectory=azure-monitor"

You can build a wheel to distribute for test using the following command:
pip wheel --no-deps "git+https://github.com/Azure/azure-sdk-for-python@restapi_auto_3911#egg=azure-monitor&subdirectory=azure-monitor"

If you have a local clone of this repository, you can also do:

• git checkout restapi_auto_3911
• pip install -e ./azure-monitor

Or build a wheel file to distribute for testing:

• git checkout restapi_auto_3911
• pip wheel --no-deps ./azure-monitor

Direct download

Your files can be directly downloaded here:

• azure-monitor-0.5.0.zip
• azure_monitor-0.5.0-py2.py3-none-any.whl

[AutorestCI]

This PR has been merged into #3345