[docs] [issue18985] Improve the documentation in fcntl module

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0e0dded5d616 by R David Murray in branch '3.3':
#18985: Improve fcntl documentation.
http://hg.python.org/cpython/rev/0e0dded5d616

New changeset ddf6da99b3cd by R David Murray in branch 'default':
Merge #18985: Improve fcntl documentation.
http://hg.python.org/cpython/rev/ddf6da99b3cd

New changeset 645aa4f44aa4 by R David Murray in branch '2.7':
backport #18985: Improve fcntl documentation.
http://hg.python.org/cpython/rev/645aa4f44aa4

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nosy: +python-dev

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