Fix inconsistent and misleading description of how min() and max() treat arguments with differing types. Replace with simple explanation, and add matching examples to both pages which show various behaviours.

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Provided by anonymous 48121 (rowan.collins@gmail.com)

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@334683 c90b9560-bf6c-de11-be94-00142212c4b1