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

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset d288666c1d58 by Steven Bethard in branch '3.2':
Issue #9343: Document that argparse parent parsers must be configured before their children.
http://hg.python.org/cpython/rev/d288666c1d58

New changeset 15e98607555d by Steven Bethard in branch '2.7':
Issue #9343: Document that argparse parent parsers must be configured before their children. (Merge from 3.2.)
http://hg.python.org/cpython/rev/15e98607555d

New changeset 8bdc20468cbc by Steven Bethard in branch 'default':
Issue #9343: Document that argparse parent parsers must be configured before their children. (Merge from 3.2.)
http://hg.python.org/cpython/rev/8bdc20468cbc

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nosy: +python-dev

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