[docs] A more concise example for OrederedEnum

[אלעזר]

Instead of implementing 4 comparison methods, I suggest using
total_ordering:

>>> from functools import total_ordering
>>> @total_ordering
... class OrderedEnum(Enum):
...     def __gt__(self, other):
...         if self.__class__ is other.__class__:
...             return self.value > other.value
...         return NotImplemented
...

I believe the reader needn't be famiiar with total_ordering() to understand
what's going on here.

elazar
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