[docs] [issue27505] Missing documentation for setting module __class__ attribute

[Cheryl Sabella]

Cheryl Sabella <chekat2 at gmail.com> added the comment:

Thanks Nick.  I've made the PRs for the versionadded and to add __class__ to the 3.6 docs.

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stage: patch review -> needs patch
versions: +Python 3.7 -Python 3.5

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