JS cleanup for cr_elements

ui/webui/resources/cr_elements/cr_button/cr_button.js

-/* Copyright 2015 The Chromium Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file. */
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 /**
  * @fileoverview
- * 'cr-button' is a chrome-specific wrapper around paper-button.
+ * `cr-button` is a chrome-specific wrapper around paper-button.
  *
  * Example:
  *
  *    <cr-button>Press Here</cr-button>
  *    <cr-button raised>Raised Button</cr-button>
  *    <cr-button>
  *      <core-icon icon="favorite"></core-icon> Custom button
  *    </cr-button>
  *
  * @group Chrome Elements
@@ skipping 13 matching lines @@
     /**
      * If true, the button will be disabled and greyed out.
      *
      * @attribute disabled
      * @type boolean
      * @default false
      */
     disabled: {value: false, reflect: true},
   },
 });