Rewrite notifications documentation.

chrome/common/extensions/docs/server2/static/css/site.css

 /* Copyright (c) 2012 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.
  */
 
 .hidden {
   display: none;
 }
 
 body {
@@ skipping 112 matching lines @@
   color: #50A9D5;
 }
 
 code {
   font-size: 10pt;
 }
 
 pre {
   font-size: 10pt;
   background-color: #F5F5F5;
-  border-top: 1px solid #DDD;
-  border-left: 1px solid #DDD;
   margin: 1em 0 0 0;
   padding: .99em;
   overflow: auto;
   word-wrap: break-word;
 }
 
+pre a {
+  text-decoration: underline!important;
+}
+
 pre b {
   background: yellow;
 }
 
 dt {
   font-weight: bold;
   margin: .75em 0 0 0;
 }
 
 dl {
@@ skipping 279 matching lines @@
 
 td.gsc-input {
   padding: 0 0;
 }
 
 div.gsc-input-box {
   height: 30px;
   width: 250px;
   float: right;
 }