[issue8325] improve regrtest command line help

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

That diff format looks fine to me. I'll review the content of your changes in the next day or so.

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keywords: +easy, needs review
priority:  -> normal
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8325>
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