[docs] [issue5501] Update multiprocessing docs re: freeze_support

[Davin Potts]

Davin Potts added the comment:

Thank you, Winterflower, for the nudge to see this set right.

In truth, invoking multiprocessing.freeze_support() has zero effect on platforms other than Windows.

This should be reflected in the 2.7 docs as well as the 3.x docs that are still actively being updated.

Attached are 2 patches -- they should be cleanly applied to the 2.7, 3.5, and default (3.6) branches.  This change clarifies the last line of existing documentation around freeze_support() as well as clearly states what I mentioned above.

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assignee: jnoller -> davin
stage:  -> patch review
versions: +Python 3.5, Python 3.6 -Python 3.2
Added file: http://bugs.python.org/file41330/issue_5501_explicit_freeze_support_nonWin_v27.patch

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