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

chrome/common/extensions/api/runtime.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": "runtime",
     "dependencies": [ "events", "tabs" ],
     "documentation_permissions_required": ["runtime"],
     "types": [
@@ skipping 267 matching lines @@
         ]
       },
       {
         "name": "onSuspend",
         "type": "function",
         "description": "Sent to the event page just before it is unloaded. This gives the extension opportunity to do some clean up. Note that since the page is unloading, any asynchronous operations started while handling this event are not guaranteed to complete. If more activity for the event page occurs before it gets unloaded the onSuspendCanceled event will be sent and the page won't be unloaded. "
       },
       {
         "name": "onSuspendCanceled",
         "type": "function",
-        "description": "Sent after onSuspend() to indicate that the app won't be unloaded after all."
+        "description": "Sent after onSuspend to indicate that the app won't be unloaded after all."
       },
       {
         "name": "onUpdateAvailable",
         "type": "function",
         "description": "Fired when an update is available, but isn't installed immediately because the app is currently running. If you do nothing, the update will be installed the next time the background page gets unloaded, if you want it to be installed sooner you can explicitly call chrome.runtime.reload().",
         "parameters": [
           {
             "type": "object",
             "name": "details",
             "properties": {
@@ skipping 58 matching lines @@
           "optional": "true",
           "description": "Return true from the event listener if you wish to call <code>sendResponse</code> after the event listener returns."
         }
       }
 
 
 
     ]
   }
 ]