Document @return value for load_plugin_textdomain(). props jdgrimes.

Document $path parameter for load_child_theme_textdomain().

fixes #28690.
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Avoid overwriting $error global with an interim variable.

props MikeLittle.
fixes #28691.
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Support descriptions for individual customizer controls.

* Control title (label) markup will also only be output if specified.
* Control section descriptions are no longer italicized for visual hierarchy / differentiation.

props celloexpressions. fixes #27981.

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Replace a redundant ! is_preview() check with a more appropriate one.

fixes #20496.
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Remove obsolete comment in `wptexturize()`.

http://irclogs.wordpress.org/chanlog.php?channel=wordpress-dev&day=2014-06-30&sort=asc#m879104

See [28831].

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