More tweaks to @param docs in wp-includes/plugin.php.

see #28516.
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List the expected @param type first.

see #28516.
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Show a "No themes found" message if the search for an installed theme doesn't produce any results.

props gauravmittal1995 for initial patch.
fixes #28587.
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General phpDoc fixes in wp-includes/plugin.php.

See #28516.

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git-svn-id: http://core.svn.wordpress.org/trunk@28690 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce a filter to control the minimum characters required for an AJAX term search. Fixes #13580. Props iamfriendly, brianlayman
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Normalise the schemes used in `get_home_path()` so it returns the correct path for sites using SSL in the admin area but not the front end. Fixes #25767. Props GregLone for the initial patch.
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Introduce `is_https_url()` for testing whether the scheme for a given URL is `https`. See #28487.
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