[docs] [issue10433] Document unique behavior of 'getgroups' on OSX

[Ned Deily]

Ned Deily <nad at acm.org> added the comment:

Committed with minor revisions for 2.7.4, 3.2.4, and 3.3.0a3.

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resolution:  -> fixed
stage: commit review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10433>
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