[docs] [issue17352] Be clear that __prepare__ must be declared as a class method

[Ethan Furman]

Ethan Furman added the comment:

Should __prepare__ be special-cased as a classmethod, like __new__ is?  Is there any reason to ever have __prepare__ /not/ be a classmethod?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17352>
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