Add missing `$path` parameter phpdoc for `load_theme_textdomain()`.

see #16750.

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Clarify phpdoc descriptions for `esc_attr_x()` and `esc_html_x()`.

props ericlewis. Fixes #24212. 

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git-svn-id: http://core.svn.wordpress.org/trunk@25414 1a063a9b-81f0-0310-95a4-ce76da25c4cd