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

[Andy Maier]

Andy Maier added the comment:

Uploaded issue12067-expressions_v4.diff to improve the unicode footnote 3, and to revert to using the term "lexicographical" for sequences (after learning that it applies there as well). Also, this version was produced using "hg diff" to make it properly reviewable.

Please review.

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Added file: http://bugs.python.org/file35845/issue12067-expressions_v4.diff

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