Use correct closing tag for "Under the Hood" header on About screen.

props tyxla.
fixes #31402.
Built from https://develop.svn.wordpress.org/trunk@31503


git-svn-id: http://core.svn.wordpress.org/trunk@31484 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/about.php

@@ -126,7 +126,7 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 <hr />
 
 <div class="changelog feature-list">
-	<h2><?php _e( 'Under the Hood' ); ?></h3>
+	<h2><?php _e( 'Under the Hood' ); ?></h2>
 
 	<div class="feature-section col two-col">
 		<div>

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31502';
+$wp_version = '4.2-alpha-31503';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.