[docs] [issue22346] asyncio documentation does not mention provisional status

[Roundup Robot]

Roundup Robot added the comment:

New changeset fefe7822e6b8 by Nick Coghlan in branch '3.4':
Issue #22346: also include asyncio PEP 411 notice in 3.4
http://hg.python.org/cpython/rev/fefe7822e6b8

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<http://bugs.python.org/issue22346>
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