[issue39452] Improve the __main__ module documentation

[Jack DeVries]

Jack DeVries <jdevries3133 at gmail.com> added the comment:

Hi All,

As I wrote on the PR::

    I am picking up the torch on 39452, continuing where @maggyero left 
    off, and also implementing my discourse proposal, which seemed to be 
    well-liked.

Feel free to leave any feedback for me on the GitHub PR, I'm looking forward to continuing to develop this work based on community feedback.

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<https://bugs.python.org/issue39452>
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