[docs] [issue15243] Misleading documentation for __prepare__

[Berker Peksag]

Berker Peksag added the comment:

The documentation should mention that the __prepare__ method must be implemented as a classmethod (see msg164697 for the reference.)

The example at https://docs.python.org/dev/reference/datamodel.html#metaclass-example needs to be linked from the "Preparing the class namespace" section.

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nosy: +berker.peksag

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<http://bugs.python.org/issue15243>
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