First-run documention of `WP_Query` argument defaults.

Props siobhan for some language tweaks. Props DrewAPicture.
See #25367.

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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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