[docs] [issue42870] Document changed argparse output wrt optional arguments in What's new in Python 3.10

Jan. 11, 2021


      Change by Tomáš Hrnčiar <tomas.hrnciar@me.com>:


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keywords: +patch
nosy: +hrnciar
nosy_count: 5.0 -> 6.0
pull_requests: +23017
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24190

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