[docs] [issue30644] [EASY][doc] Document that signal.set_wakeup_fd(-1), unregister the previsouly set wakeup FD

[Antoine Pitrou]

Antoine Pitrou added the comment:

> This issue is an EASY issue: please leave it to real newcomers who didn't write any PR to CPython previously. Core developers: explain how to fix the issue, don't fix it ;-)

Too late, sorry!

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nosy: +pitrou

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<http://bugs.python.org/issue30644>
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