fix license date and comment about loaded polyfills

Author: dfreedm

entrypoints/webcomponents-hi-sd-index.js

@@ -1,6 +1,6 @@
 /**
 @license
-Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
@@ -10,7 +10,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 'use strict';
 
 /*
- * Polyfills loaded: HTML Imports, Custom Elements, Shady DOM/Shady CSS
+ * Polyfills loaded: HTML Imports, Shady DOM/Shady CSS
  * Used in: Firefox with CustomElements enabled
  */