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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 39e7995f9ad1 by Guido van Rossum in branch 'default':
Silently ignore unregistering closed files. Fixes issue 19876. With docs and slight test refactor.
http://hg.python.org/cpython/rev/39e7995f9ad1

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nosy: +python-dev

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<http://bugs.python.org/issue19876>
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