[issue31914] Document Pool.(star)map return type

[Alex Waygood]

Alex Waygood <Alex.Waygood at Gmail.com> added the comment:

This appears to have been fixed in PR 26560 in the main branch, but it might be nice to backport it to 3.10 and 3.9

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nosy: +AlexWaygood, mdk
stage:  -> backport needed
type: enhancement -> behavior
versions: +Python 3.10, Python 3.9 -Python 3.6

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