> What more do you want?

Mainly: it says "a parent or sibling class of *type*" but it doesn't explain which class it actually uses.

And the sentence "The __mro__ attribute of the type lists the method resolution search order used by both getattr() and super()" is even wrong or at least confusing: what matters is not the MRO of the type (the first argument to super()) but the MRO of the object (the second argument to super()).

The zero-argument form super() is not explained at all.

> Perhaps there ought to be a "gentle guide to super" somewhere, and the docs could link to that?

There are plenty of guides like that and in fact that docs already link to https://rhettinger.wordpress.com/2011/05/26/super-considered-super/