[docs] [issue23356] In argparse docs simplify example about argline

[Berker Peksag]

Berker Peksag added the comment:

LGTM

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assignee: docs at python -> berker.peksag
nosy: +berker.peksag
stage:  -> commit review
type: performance -> enhancement
versions: +Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23356>
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