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

[Vajrasky Kok]

Vajrasky Kok added the comment:

Updated patch based on Ezio's review. I reverted back the changes to Nul and module documentation (since it is not so clear whether we should categorize flock as Unix routine or not).

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Added file: http://bugs.python.org/file31795/fix_documentation_on_fcntl_module_v2.patch

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