Bug 339485: Document Alt+(Up|Down) and F4 shortcuts in search box. r=jeff

browser/locales/en-US/chrome/help/shortcuts.xhtml

@@ -53,7 +53,6 @@ Contributors:
         </span>
         <span class="unix">
           &altKey;+<kbd>Left Arrow</kbd><br/>
-          <kbd>Backspace</kbd><br/>
           &accelKey;+<kbd>[</kbd>
         </span>
         <span class="mac">
@@ -72,7 +71,6 @@ Contributors:
         </span>
         <span class="unix">
           &altKey;+<kbd>Right Arrow</kbd><br/>
-          &shiftKey;+<kbd>Backspace</kbd><br/>
           &accelKey;+<kbd>]</kbd>
         </span>
         <span class="mac">
@@ -355,19 +353,16 @@ Contributors:
         &accelKey;+<kbd>L</kbd></td>
     </tr>
     <tr>
-      <td>Select Previous Search Engine<br/>
+      <td>Select or Manage Search Engines<br/>
         (when Search Bar is focused)</td>
-      <td>&accelKey;+<kbd>Up Arrow</kbd></td>
-    </tr>
-    <tr>
-      <td>Select Next Search Engine<br/>
-        (when Search Bar is focused)</td>
-      <td>&accelKey;+<kbd>Down Arrow</kbd></td>
+      <td>&altKey;+<kbd>Up Arrow</kbd><br/>
+        &altKey;+<kbd>Down Arrow</kbd><span class="noMac"><br/>
+        <kbd>F4</kbd></span></td>
     </tr>
   </tbody>
 </table>
 
-<div class="contentsBox"><em>08 April 2006</em></div>
+<div class="contentsBox"><em>02 June 2006</em></div>
 <p>Copyright &copy; 2003-2006 Contributors to the Mozilla Help Viewer Project.</p>
 
 </body>