[issue11015] Bring test.support docs up to date

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I merged Cheryl's PR to the dev branch, and triggered the backport to 3.7. If nobody beats me to it, I'll merge the latter tomorrow :)

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assignee: docs at python -> ncoghlan
resolution:  -> fixed
stage: patch review -> backport needed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue11015>
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