[docs] Doc: remove errors about mixed-type comparisons. (issue 12067)

[andreas.r.maier at gmx.de]

http://bugs.python.org/review/12067/diff/13054/Doc/reference/expressions.rst
File Doc/reference/expressions.rst (right):

http://bugs.python.org/review/12067/diff/13054/Doc/reference/expressions.rst#newcode1174
Doc/reference/expressions.rst:1174: 
Should we move the remainder of this section to 3.3.1. "Basic
customization" of the Language Reference?

http://bugs.python.org/review/12067/