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

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

This was merged into 3.7 and later reverted after 3.7 first beta as per https://bugs.python.org/issue20104#msg316588 . Adding Pablo for review.

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nosy: +pablogsal, xtreak

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