[docs] [issue42061] Document __format__ method for IPv[46]Address

New submission from Eric V. Smith <eric@trueblade.com>: This feature was added in issue 32820, but was never documented. ---------- assignee: docs@python components: Documentation keywords: easy, newcomer friendly messages: 378812 nosy: docs@python, eric.smith priority: normal severity: normal stage: needs patch status: open title: Document __format__ method for IPv[46]Address type: enhancement versions: Python 3.10, Python 3.9 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue42061> _______________________________________