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

[Alexander Belopolsky]

Changes by Alexander Belopolsky <belopolsky at users.sourceforge.net>:


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assignee:  -> docs at python
components: +Documentation, Macintosh
nosy: +docs at python
versions: +Python 3.2

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