Fix some typos, broken links and other issues in extension docs

chrome/common/extensions/api/bookmarks.json

 // 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.
 
 [
   {
     "namespace": "bookmarks",
     "uses_feature_system": true,
     "channel": "stable",
     "dependencies": ["permission:bookmarks"],
@@ skipping 484 matching lines @@
                 "type": "array",
                 "items": { "type": "string" }
               }
             }
           }
         ]
       },
       {
         "name": "onImportBegan",
         "type": "function",
-        "description": "Fired when a bookmark import session is begun.  Expensive observers should ignore handleCreated updates until onImportEnded is fired.  Observers should still handle other notifications immediately.",
+        "description": "Fired when a bookmark import session is begun.  Expensive observers should ignore handle onCreated updates until onImportEnded is fired.  Observers should still handle other notifications immediately.",

[Mike West, 2013/02/11 08:21:53]

Please drop "handle". "Expensive observers should ignore 'onCreated'
updates...".

[方觉(Fang Jue), 2013/02/11 11:37:54]

Done.

         "parameters": []
       },
       {
         "name": "onImportEnded",
         "type": "function",
         "description": "Fired when a bookmark import session is ended.",
         "parameters": []
       }
     ]
   }
 ]