[docs] [issue27428] Document WindowsRegistryFinder inherits from MetaPathFinder

[Cheryl Sabella]

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

Since WindowsRegistryFinder was deprecated in 3.6, should this be closed or should the documentation still be corrected?

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nosy: +csabella
versions: +Python 3.7 -Python 3.5, Python 3.6

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