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

see #28516.
Built from https://develop.svn.wordpress.org/trunk@28888


git-svn-id: http://core.svn.wordpress.org/trunk@28687 1a063a9b-81f0-0310-95a4-ce76da25c4cd
List the expected @param type first.

see #28516.
Built from https://develop.svn.wordpress.org/trunk@28889


git-svn-id: http://core.svn.wordpress.org/trunk@28688 1a063a9b-81f0-0310-95a4-ce76da25c4cd