[docs] [issue19820] docs are missing info about module attributes

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

The relevant module attributes are described in the importlib docs: https://docs.python.org/3/library/importlib.html#importlib.abc.Loader.load_module

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versions: +Python 3.7, Python 3.8, Python 3.9 -Python 3.3, Python 3.4

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<https://bugs.python.org/issue19820>
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