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

[Charles-François Natali]

Charles-François Natali added the comment:

Sorry for the delay, I didn't have any free time this week.
I'll review the patch shortly, but the idea sounds fine (I just need
to check if we can't be a little more specific for errnos upon
unregister).

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