[docs] [issue11233] clarifying Availability: Unix

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Thank you Sandro Tosi for the bug report, thanks Georg Brandl for initial patch, and thanks Cheryl Sabella for the final changes in 3.7 and master!

According to Yury Selivanov, it's not need to backport this change to 2.7 and 3.6, so I close the issue.
https://github.com/python/cpython/pull/9692#issuecomment-429364037

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.7

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<https://bugs.python.org/issue11233>
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