Accessibility: Fix the headings hierarchy in the legacy Custom Background and Custom Header pages.

Fixes #47386.

Built from https://develop.svn.wordpress.org/trunk@45411


git-svn-id: http://core.svn.wordpress.org/trunk@45222 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/custom-background.php

@@ -244,7 +244,7 @@ class Custom_Background {
 </div>
 		<?php } ?>
 
-<h3><?php _e( 'Background Image' ); ?></h3>
+<h2><?php _e( 'Background Image' ); ?></h2>
 
 <table class="form-table" role="presentation">
 <tbody>
@@ -338,7 +338,7 @@ class Custom_Background {
 </tbody>
 </table>
 
-<h3><?php _e( 'Display Options' ); ?></h3>
+<h2><?php _e( 'Display Options' ); ?></h2>
 <form method="post">
 <table class="form-table" role="presentation">
 <tbody>

wp-admin/custom-header.php

@@ -488,7 +488,7 @@ class Custom_Image_Header {
 </div>
 		<?php } ?>
 
-<h3><?php _e( 'Header Image' ); ?></h3>
+<h2><?php _e( 'Header Image' ); ?></h2>
 
 <table class="form-table" role="presentation">
 <tbody>
@@ -687,7 +687,7 @@ class Custom_Image_Header {
 
 		<?php if ( current_theme_supports( 'custom-header', 'header-text' ) ) : ?>
 
-<h3><?php _e( 'Header Text' ); ?></h3>
+<h2><?php _e( 'Header Text' ); ?></h2>
 
 <table class="form-table" role="presentation">
 <tbody>

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45410';
+$wp_version = '5.3-alpha-45411';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.