[issue13574] refresh example in doc for Extending and Embedding

[Mark Lawrence]

Mark Lawrence added the comment:

https://docs.python.org/3/extending/newtypes.html still refers to PyInstanceObject, I'm sorry but I've no idea what the replacement is called, so I'll leave this to someone in the know.

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nosy: +BreamoreBoy
versions: +Python 3.5 -Python 3.2, Python 3.3

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