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

[Jack DeVries]

Change by Jack DeVries <jdevries3133 at gmail.com>:


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keywords: +patch
nosy: +jack__d
nosy_count: 8.0 -> 9.0
pull_requests: +26356
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/26883

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