[docs] [issue28455] argparse: convert_arg_line_to_args does not actually expect self argument

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4f8f7403881f by Berker Peksag in branch '3.5':
Issue #28455: Clarify example of overriding the convert_arg_line_to_args method
https://hg.python.org/cpython/rev/4f8f7403881f

New changeset 0b29adb5c804 by Berker Peksag in branch '3.6':
Issue #28455: Merge from 3.5
https://hg.python.org/cpython/rev/0b29adb5c804

New changeset a293e5db9083 by Berker Peksag in branch 'default':
Issue #28455: Merge from 3.6
https://hg.python.org/cpython/rev/a293e5db9083

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nosy: +python-dev

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