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

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

I do understand the issue, but I'm not sure if I can write it down consisely. I've attached an initial attempt (patch is relative to the default branch, I'll port to 2.7 and 3.2 if it looks OK)

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keywords: +needs review, patch
Added file: http://bugs.python.org/file21133/issue10433.patch

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