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

Andy Maier added the comment: @Guido: Agree to all you said in your #msg226496. There is additional information about comparison in: - Tutorial (5.8. Comparing Sequences and Other Types), - Library Reference (5.3. Comparisons), - Language Reference (3.3.1. Basic customization) that needs to be reviewed in light of this patch. I'm just not sure I want to make this patch even larger as it is already, and tend to do that in a follow on issue and patch (unless directed otherwise). Andy ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue12067> _______________________________________