[docs] [issue11233] clarifying Availability: Unix

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset f197dac00f43 by Antoine Pitrou in branch 'default':
Merge commit for #11233
http://hg.python.org/cpython/rev/f197dac00f43

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11233>
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