[docs] [issue17359] Mention "__main__.py" explicitly in command line docs

[Nick Coghlan]

Nick Coghlan added the comment:

There's also a problem where the CLI docs claim __main__.py support was added in 2.5 - that's not accurate, it was only added in 2.6.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17359>
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