[docs] A mistake in a code snippet in `Descriptor HowTo Guide`?

[楠字数补丁也]

class Cell(object):     . . .     def getvalue(self, obj):         "Recalculate cell before returning value"         self.recalc()         return obj._value     value = property(getvalue)
the instance method `getvalue` with a positional argument `obj` can't be used as `property(getvalue)`. 


the code snippet is above https://docs.python.org/3.4/howto/descriptor.html#functions-and-methods.
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