[docs] [issue24515] docstring of isinstance

[Terry J. Reedy]

Terry J. Reedy added the comment:

I agree that the tuple explanation if ok.  But "Return whether an object is an instance of a class or of a subclass thereof." (3.5) seems wrong.  I believe 'subclass' should be 'superclass'.
    
>>> class C: pass

>>> class Csub(C): pass

>>> isinstance(C(), Csub)
False
>>> isinstance(Csub(), C)
True

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nosy: +terry.reedy
versions: +Python 3.4, Python 3.5, Python 3.6

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