Remove redundant help tab title from the tab body. see #18785.

git-svn-id: https://develop.svn.wordpress.org/trunk@18913 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/includes/screen.php

@@ -694,7 +694,6 @@ final class WP_Screen {
 						?>
 
 						<div id="<?php echo esc_attr( $panel_id ); ?>" class="<?php echo esc_attr( $classes ); ?>">
-							<h3><?php echo esc_html( $tab['title'] ); ?></h3>
 							<?php
 							// Print tab content.
 							echo $tab['content'];