Bug 256805: Remove Tell a Friend menu item description. p=jwalden, r=me

browser/components/help/locale/en-US/menu_reference.xhtml

@@ -307,9 +307,6 @@ Contributors:
   <!--h3 id="release_notes">Release Notes</h3>
   <p>Displays the release notes for the latest &brandShortName; release.</p-->
 
-  <h3 id="tell_friend">Tell a Friend</h3>
-  <p>Opens a web page that lets you tell a friend about &brandShortName;.</p>
-
   <h3 id="promote">Promote &brandShortName;</h3>
   <p>Opens a web page that gives you information on how to promote
     &brandShortName;.</p>