[docs] [issue20694] asyncio.docs: Document subprocess_exec and subprocess_shell

[Roundup Robot]

Roundup Robot added the comment:

New changeset ec3a70ef759d by Yury Selivanov in branch 'default':
asyncio.docs: Document subprocess_exec and subprocess_shell. Issue #20694.
http://hg.python.org/cpython/rev/ec3a70ef759d

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nosy: +python-dev

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