[issue23356] In argparse docs simplify example about argline

[Roundup Robot]

Roundup Robot added the comment:

New changeset 050e0c0b3d90 by Berker Peksag in branch '2.7':
Issue #23356: Simplify convert_arg_line_to_args example.
https://hg.python.org/cpython/rev/050e0c0b3d90

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<http://bugs.python.org/issue23356>
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