[pod] string_equal() returns CHARSET_COMPARE(), which can return -1, therefore string_equal can return -1.  Fix the documentation accordingly.
[pod]
string_equal() returns CHARSET_COMPARE(), which can return -1, therefore
string_equal can return -1.  Fix the documentation accordingly.


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@27313 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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