[docs] [issue12067] Doc: remove errors about mixed-type comparisons.

[Martin Panter]

Martin Panter added the comment:

Here is a port of the documentation to Python 2. Main differences:

* Default rules for order comparisons are different
* Not all kinds of objects inherit from object()
* str(), unicode() compatibility
* xrange() only seems to have default comparability
* NAN, “binary sequences” and sets not listed

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Added file: http://bugs.python.org/file46372/expressions-py2.7.diff

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