[docs] [issue12686] argparse - document (and improve?) use of SUPPRESS with help=

[Steven Bethard]

Steven Bethard added the comment:

Yeah, looks like we can close this. If anyone finds a specific bug in the use of SUPPRESS, please open a new issue.

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resolution:  -> duplicate
status: open -> closed
superseder:  -> document argparse's help=SUPPRESS

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<http://bugs.python.org/issue12686>
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