[issue20694] asyncio.docs: Document subprocess_exec and subprocess_shell

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2dfc383b4907 by Yury Selivanov in branch '3.4':
asyncio.docs: Document subprocess_exec and subprocess_shell. Issue #20694.
http://hg.python.org/cpython/rev/2dfc383b4907

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