[docs] [issue19234] socket.fileno() documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset d83007ab69e2 by Kushal Das in branch '3.5':
Issue #19234: Documents socket.fileno() returns -1 on failure
https://hg.python.org/cpython/rev/d83007ab69e2

New changeset 3c745b656dca by Kushal Das in branch 'default':
Issue #19234: Merge from 3.5
https://hg.python.org/cpython/rev/3c745b656dca

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nosy: +python-dev

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