Editor: fix warnings in class-wp-editor.php, see #30453.
Built from https://develop.svn.wordpress.org/trunk@30583


git-svn-id: http://core.svn.wordpress.org/trunk@30573 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unused CSS and JS from wp-mce-help.php, see #30517.
Built from https://develop.svn.wordpress.org/trunk@30584


git-svn-id: http://core.svn.wordpress.org/trunk@30574 1a063a9b-81f0-0310-95a4-ce76da25c4cd