EG - add samples to docstrings

[rakshith91]

Fixes #16056

[rakshith91]

/azp run python - eventgrid - tests

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[rakshith91]

/azp run python - eventgrid - tests

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[rakshith91]

/azp run python - eventgrid - tests

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Azure Pipelines successfully started running 1 pipeline(s).

[yunhaoling]

LGTM, I would recommend doing a local sphinx tox running to see if there's any sphinx warning/error we can fix, and check the generated html packages if those samples are rendered properly.

also I think we need to mention the newly-added two sample files in samples/readme?

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[rakshith91]

/azp run python - eventgrid - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[rakshith91]

/azp run python - eventgrid - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).