[issue37052] Add examples for mocking async for and async context manager in unittest.mock docs

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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keywords: +patch
pull_requests: +14467
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/14660

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37052>
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