Remove the active row theme/plugin styling on Dashboard -> Updates. Fixes #26125

Built from https://develop.svn.wordpress.org/trunk@26283


git-svn-id: http://core.svn.wordpress.org/trunk@26188 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/my-sites.php.

Props megane9988, kpdesign.
Fixes #25586.

Built from https://develop.svn.wordpress.org/trunk@26284


git-svn-id: http://core.svn.wordpress.org/trunk@26189 1a063a9b-81f0-0310-95a4-ce76da25c4cd