[docs] [issue30078] "-m unittest --help" says nothing about direct script exection

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +ezio.melotti, michael.foord, rbcollins
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30078>
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