Accessibility: bump headings one level up on the Add Plugins screen for a better headings hierarchy.

Fixes #33818.
Built from https://develop.svn.wordpress.org/trunk@35009


git-svn-id: http://core.svn.wordpress.org/trunk@34974 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-plugin-install-list-table.php

@@ -496,12 +496,12 @@ class WP_Plugin_Install_List_Table extends WP_List_Table {
 		<div class="plugin-card plugin-card-<?php echo sanitize_html_class( $plugin['slug'] ); ?>">
 			<div class="plugin-card-top">
 				<div class="name column-name">
-					<h4>
+					<h3>
 						<a href="<?php echo esc_url( $details_link ); ?>" class="thickbox">
 						<?php echo $title; ?>
 						<img src="<?php echo esc_attr( $plugin_icon_url ) ?>" class="plugin-icon" alt="">
 						</a>
-					</h4>
+					</h3>
 				</div>
 				<div class="action-links">
 					<?php

wp-admin/includes/plugin-install.php

@@ -214,7 +214,7 @@ function install_dashboard() {
 
 	<?php display_plugins_table(); ?>
 
-	<h3><?php _e( 'Popular tags' ) ?></h3>
+	<h2><?php _e( 'Popular tags' ) ?></h2>
 	<p><?php _e( 'You may also browse based on the most popular tags in the Plugin Directory:' ) ?></p>
 	<?php