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

[A.M. Kuchling]

A.M. Kuchling added the comment:

Mike Hoy: a later patch (http://bugs.python.org/issue14626) changed the API in the os module so that the wrappers for *at() functions went away; fchmod() now takes several different forms of argument and calls the correct function under the hood.

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nosy: +akuchling

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<http://bugs.python.org/issue12716>
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