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.



git-svn-id: https://develop.svn.wordpress.org/trunk@32974 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/comment.php

@@ -117,7 +117,7 @@ case 'spam'    :
 ?>
 <div class="wrap">
 
-<h2><?php echo esc_html( $title ); ?></h2>
+<h1><?php echo esc_html( $title ); ?></h1>
 
 <?php
 switch ( $action ) {