[docs] [issue36170] posix_spawn doesn't exist in 3.7

[Ned Deily]

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

Thanks for the report, Mark!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36170>
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