Proper heading for admin screens.

First step towards restoring a good heading structure in wp-admin.
The previous `<h1>` contained the site title and a link to the front page and was removed with the toolbar refactoring in 3.2.

Props joedolson, afercia.
Fixes #31650.


Built from https://develop.svn.wordpress.org/trunk@32974


git-svn-id: http://core.svn.wordpress.org/trunk@32945 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/link-manager.php

@@ -69,10 +69,10 @@ if ( ! current_user_can('manage_links') )
 ?>
 
 <div class="wrap nosubsub">
-<h2><?php echo esc_html( $title ); ?> <a href="link-add.php" class="add-new-h2"><?php echo esc_html_x('Add New', 'link'); ?></a> <?php
+<h1><?php echo esc_html( $title ); ?> <a href="link-add.php" class="add-new-h2"><?php echo esc_html_x('Add New', 'link'); ?></a> <?php
 if ( !empty($_REQUEST['s']) )
 	printf( '<span class="subtitle">' . __('Search results for &#8220;%s&#8221;') . '</span>', esc_html( wp_unslash($_REQUEST['s']) ) ); ?>
-</h2>
+</h1>
 
 <?php
 if ( isset($_REQUEST['deleted']) ) {