[docs] [issue28049] Add documentation for typing.Awaitable and friends

[Roundup Robot]

Roundup Robot added the comment:

New changeset eba19d4b2944 by Guido van Rossum in branch 'default':
Issue #28049: Add documentation for typing.Awaitable and friends.
https://hg.python.org/cpython/rev/eba19d4b2944

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nosy: +python-dev

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