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

[STINNER Victor]

STINNER Victor added the comment:

> Old code looked strange after issue18571:

epoll_create() is a deprecated. epoll_create(size): "Since Linux
2.6.8, the size argument is ignored, but must be  greater  than  zero"
according to the man page. So it's fine to always call
epoll_create1(flags).

Example of new potential new flag for epoll_create1(): ten years ago,
EPOLL_NONBLOCK was proposed:
https://lkml.org/lkml/2008/8/24/130
(but it seems like it doesn't make sense, since the syscall cannot block)

Recent epoll evolutions don't seem to be on epoll_create1():
https://lwn.net/Articles/633422/

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