[docs] [issue22456] __base__ undocumented

[Raymond Hettinger]

Raymond Hettinger added the comment:

I think that __base__ was intended to be a non-guaranteed implementation detail for new-style classes just like  __dictoffset__ and __flags__ .

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nosy: +gvanrossum, rhettinger

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<http://bugs.python.org/issue22456>
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