[docs] [issue26747] types.InstanceType only for old style class only in 2.7

[Roundup Robot]

Roundup Robot added the comment:

New changeset b684298671f9 by Berker Peksag in branch '2.7':
Issue #26747: Document that InstanceTypes only works for old-style classes
https://hg.python.org/cpython/rev/b684298671f9

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nosy: +python-dev

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<http://bugs.python.org/issue26747>
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