Remove old DFW width adjustment help text.

fixes #30517
Built from https://develop.svn.wordpress.org/trunk@30582


git-svn-id: http://core.svn.wordpress.org/trunk@30572 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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