[docs] [issue20100] epoll docs are not clear with regards to CLOEXEC.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

There is small behavior difference. Currently OSError raised for invalid flags has errno=EINVAL, with the patch it wouldn't have errno. If this is okay, the patch LGTM.

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nosy: +serhiy.storchaka

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