[issue32820] Add and document __format__ method for IPv[46]Address

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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pull_requests: +15957
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/16378

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32820>
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