[docs] [issue12716] Reorganize os docs for files/dirs/fds

[Roundup Robot]

Roundup Robot added the comment:

New changeset 88edac3bc2fc by Andrew Kuchling in branch 'default':
#12716: reorganize docs for os module a bit
http://hg.python.org/cpython/rev/88edac3bc2fc

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nosy: +python-dev

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