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

[Michael Anckaert]

Michael Anckaert <michael.anckaert at sinax.be> added the comment:

@emmanuel: thanks for offering your help. 

I made a first attempt at improving the docs in this branch: https://github.com/MichaelAnckaert/cpython/tree/bpo-19820

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