Updates

wp-admin/update.php

@@ -201,7 +201,7 @@ if ( isset($_GET['action']) ) {
 		if ( ! current_user_can('install_themes') )
 			wp_die( __( 'You do not have sufficient permissions to install themes on this site.' ) );
 
-		include_once( ABSPATH . 'wp-admin/includes/theme-install.php' ); //for themes_api..
+		include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' ); //for themes_api..
 
 		check_admin_referer( 'install-theme_' . $theme );
 		$api = themes_api('theme_information', array('slug' => $theme, 'fields' => array('sections' => false, 'tags' => false) ) ); //Save on a bit of bandwidth.
@@ -261,7 +261,7 @@ if ( isset($_GET['action']) ) {
 		/**
 		 * Fires when a custom plugin or theme update request is received.
 		 *
-		 * The dynamic portion of the hook name, $action, refers to the action
+		 * The dynamic portion of the hook name, `$action`, refers to the action
 		 * provided in the request for wp-admin/update.php. Can be used to
 		 * provide custom update functionality for themes and plugins.
 		 *