Capitalize 'ID' correctly to avoid random failures of Tests_Tax_Query::test_term_taxonomy_id_field_no_taxonomy().

see #25284.
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Fix typo in mbstring_binary_safe_encoding() description.

props ghost1227.
fixes #28423.
Built from https://develop.svn.wordpress.org/trunk@28648


git-svn-id: http://core.svn.wordpress.org/trunk@28466 1a063a9b-81f0-0310-95a4-ce76da25c4cd