[issue39278] add docstrings to functions in pdb module

[Carl Bordum Hansen]

Change by Carl Bordum Hansen <carl at bordum.dk>:


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keywords: +patch
pull_requests: +17331
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/17924

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39278>
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