[issue20706] asyncio.docs: Fix wording in 'this method returns a coroutine object'

[Roundup Robot]

Roundup Robot added the comment:

New changeset cd23d0c3f850 by Yury Selivanov in branch 'default':
asyncio.docs: Improve wordings; add a note to the Coroutines section. Issue #20706
http://hg.python.org/cpython/rev/cd23d0c3f850

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nosy: +python-dev

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