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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0f26daac85bb by Yury Selivanov in branch '3.4':
asyncio.docs: Improve wordings; add a note to the Coroutines section. Issue #20706
http://hg.python.org/cpython/rev/0f26daac85bb

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