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

[Andy Maier]

Andy Maier added the comment:

I have addressed the comments by Jim Jewett, Martin Panter and of myself in a new version v11, which got posted.

For the expression.rst doc file, this version of the patch has its diff sections in a logical order, so that the original text and the patched text are close by each other.

Please review.

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Added file: http://bugs.python.org/file36920/issue12067-expressions-py34_v11.diff

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