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

[STINNER Victor]

STINNER Victor added the comment:

"Except that it can fail with ENOENT, but also EBADF, and EPERM if the
FD has been reused by a FD which doesn't support epoll."

Oh, I didn't know that. I ran the unit test, and I expected the two unit test to cover any error case. So ignore my epoll_except.patch, the current "except OSError: pass" is correct.

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