[docs] [issue9343] Document that argparse "parents" must be fully declared before children

Éric Araujo merwok@netwok.org added the comment:

I removed 3.3, since it currently means “won’t be done for 3.2, so note for later.” I don’t know if the report applies to 3.1 (doc fixes go into stable releases too), so I’m not adding it.

---------- nosy: +merwok versions: -Python 3.3

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