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

[Guido van Rossum]

Guido van Rossum added the comment:

I don't think we should be more selective about the errno values, the try block is narrow enough (just one syscall) and we really don't know what the kernel will do on different platforms.  And what would we do about it anyway?

I will look into the Windows problem, but I suspect the best we can do there is skip the test.

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