Remove 'Insert Multiple Images' from the about page as it is now completely...

Remove 'Insert Multiple Images' from the about page as it is now completely invisible in the UI. Requiring shift-click but not mentioning it is a bad omen. props helenyhou. fixes #22455. 



git-svn-id: https://core.svn.wordpress.org/trunk@23126 1a063a9b-81f0-0310-95a4-ce76da25c4cd