Cleanup: fix some CSS comment styles (especially copyrights)

chrome/browser/resources/pdf/elements/viewer-bookmark/viewer-bookmark.css

 /* 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. */
 
 #item {
   @apply(--layout-center);
   @apply(--layout-horizontal);
   color: rgb(80, 80, 80);
   cursor: pointer;
   font-size: 77.8%;
   height: 30px;
   position: relative;
 }
 
 #item:hover {
   background-color: rgb(237, 237, 237);
   color: rgb(20, 20, 20);
 }
 
 paper-ripple {
   /* Allowing the ripple to capture pointer events prevents a focus rectangle
    * for showing up for clicks, while still allowing it with tab-navigation.
    * This undoes a paper-ripple bugfix aimed at non-Chrome browsers.
    * TODO(tsergeant): Improve focus in viewer-bookmark so this can be removed
-   * (https://crbug.com/5448190).
-   */
+   * (https://crbug.com/5448190). */
   pointer-events: auto;
 }
 
 #title {
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
 #expand {
   --iron-icon-height: 16px;
   --iron-icon-width: 16px;
   --paper-icon-button-ink-color: var(--paper-grey-900);
   height: 28px;
   min-width: 28px;
   padding: 6px;
   transition: transform 150ms;
   width: 28px;
 }
 
 :host-context([dir=rtl]) #expand {
   transform: rotate(180deg);
 }
 
 :host([children-shown]) #expand {
   transform: rotate(90deg);
 }