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

Mon May 19 03:29:23 CEST 2014

Changes by Ethan Furman <ethan at stoneleaf.us>:

----------
nosy: +ethan.furman

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

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

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