[docs] [issue20683] Add example to tutorial namespace doc, section 9.2

[Mark Lawrence]

Mark Lawrence added the comment:

What is wrong with the example given here https://docs.python.org/3/tutorial/classes.html#scopes-and-namespaces-example ?

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nosy: +BreamoreBoy

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20683>
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