[issue24632] Improve documentation about __main__.py

[Jack DeVries]

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


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keywords: +patch
nosy: +jack__d
nosy_count: 11.0 -> 12.0
pull_requests: +26357
stage: needs patch -> 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/issue24632>
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