[docs] [issue19876] selectors (and asyncio?): document behaviour on closed files/sockets

[Roundup Robot]

Roundup Robot added the comment:

New changeset f334dd2471e7 by Guido van Rossum in branch 'default':
News item for issue 19876.
http://hg.python.org/cpython/rev/f334dd2471e7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19876>
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