[AutoPR cognitiveservices/data-plane/Face] [Cogs Face] Refine the documentation for Face API's new Snapshot features.

[AutorestCI]

Created to sync Azure/azure-rest-api-specs#5094

[AutorestCI]

(message created by the CI based on PR content)

Installation instruction

Package azure-cognitiveservices-vision-face

You can install the package azure-cognitiveservices-vision-face of this PR using the following command:
pip install "git+https://github.com/Azure/azure-sdk-for-python@restapi_auto_5094#egg=azure-cognitiveservices-vision-face&subdirectory=azure-cognitiveservices-vision-face"

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_5094#egg=azure-cognitiveservices-vision-face&subdirectory=azure-cognitiveservices-vision-face"

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

• git checkout restapi_auto_5094
• pip install -e ./azure-cognitiveservices-vision-face

Or build a wheel file to distribute for testing:

• git checkout restapi_auto_5094
• pip wheel --no-deps ./azure-cognitiveservices-vision-face

Direct download

Your files can be directly downloaded here:

• azure-cognitiveservices-vision-face-1.0.zip
• azure_cognitiveservices_vision_face-1.0-py2.py3-none-any.whl

[codecov-io]

Codecov Report

Merging #4240 into restapi_auto_cognitiveservices/data-plane/Face will increase coverage by <.01%.
The diff coverage is n/a.

@@                                Coverage Diff                                 @@
##           restapi_auto_cognitiveservices/data-plane/Face    #4240      +/-   ##
==================================================================================
+ Coverage                                           53.76%   53.76%   +<.01%     
==================================================================================
  Files                                                9864     9868       +4     
  Lines                                              210011   210015       +4     
==================================================================================
+ Hits                                               112913   112917       +4     
  Misses                                              97098    97098

Impacted Files	Coverage Δ
...ces/vision/face/models/find_similar_request_py3.py	41.66% <ø> (ø)	⬆️
...ices/vision/face/operations/snapshot_operations.py	23% <ø> (ø)	⬆️
...ervices/vision/face/models/find_similar_request.py	41.66% <ø> (ø)	⬆️
...services/vision/face/operations/face_operations.py	30.93% <ø> (ø)	⬆️
...ault/azure/keyvault/v7_0/models/secret_item_py3.py	100% <0%> (ø)	⬆️
...ource_sql_server_task_output_database_level_py3.py	41.66% <0%> (ø)	⬆️
...ure/mgmt/monitor/models/metric_availability_py3.py	100% <0%> (ø)	⬆️
...etwork/v2018_11_01/models/virtual_hub_route_py3.py	57.14% <0%> (ø)	⬆️
...zure/mgmt/network/v2018_08_01/models/subnet_py3.py	100% <0%> (ø)	⬆️
...t/recoveryservicesbackup/models/bek_details_py3.py	50% <0%> (ø)	⬆️
... and 3810 more

---

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[AutorestCI]

This PR has been merged into #4220