Use WP_Screen::add_help_tab(). see #19020
git-svn-id: https://core.svn.wordpress.org/trunk@19514 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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git-svn-id: https://core.svn.wordpress.org/trunk@19514 1a063a9b-81f0-0310-95a4-ce76da25c4cd