[docs] [issue11015] Bring test.support docs up to date

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Since Nick already merged and backported, at least a new PR is needed.  Since this is an old issue with a long discussion and several inactives on the nosy list, I suggest a new issue starting from the merge result as a base: "More revisions to test.support docs".  Make a list of Serhiy's questions and comments.

TESTFN_NONASCII - How different from TESTFN_UNICODE?
PGO -  value? True/False?
TEST_SUPPORT_DIR - Not used.
...

Add Nick, Serhiy, and me as nosy.  We can discuss there how to handle the additional issues.

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components: +Documentation, Tests
stage: backport needed -> resolved
status: open -> closed
versions: +Python 3.7

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