[docs] [issue24632] Improve documentation about __main__.py

[Nick Coghlan]

Nick Coghlan added the comment:

In the same vein of "I never worked out a good offical home for it", a couple of the "Traps for the Unwary" I describe for Python's import system are closely related to __main__ module execution and the impact that has on sys.path and sys.modules:

* http://python-notes.curiousefficiency.org/en/latest/python_concepts/import_traps.html#the-double-import-trap
* http://python-notes.curiousefficiency.org/en/latest/python_concepts/import_traps.html#executing-the-main-module-twice

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<http://bugs.python.org/issue24632>
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