[docs] [issue16048] Tutorial-classes-remarks: replace paragragh

[Terry J. Reedy]

Terry J. Reedy added the comment:

Ian Kelly reminds me that instance.__xxx__ is only skipped by the internal machinery and not by direct accesses in user code. In the other hand, docs, official or otherwise, are filled with things like 'len(a) calls a.__len__', so I think something should be said that giving instances special method attributes does not have the effect one might expect.

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<http://bugs.python.org/issue16048>
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