[issue31304] Update doc for starmap_async error_back kwarg

[Mariatta Wijaya]

Mariatta Wijaya <mariatta.wijaya at gmail.com> added the comment:

This has been fixed. Thanks!

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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/issue31304>
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