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

[Irit Katriel]

Irit Katriel <iritkatriel at yahoo.com> added the comment:

Do these PRs need to be backported? They're in 3.9 but not 3.8.

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nosy: +iritkatriel

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<https://bugs.python.org/issue32820>
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