change wording of no-results message to match the new site-search menu item

Author: randyl

template/header.html

@@ -9,7 +9,7 @@
                 accesskey="f" title="Enter term to search for (hit Esc to focus)">
         </div>
         <p id="not-found-message">
-            Not in Index (<a href="" id="try-web-search">try web search</a>)
+            Not in Index (<a href="" id="try-web-search">try site search</a>)
         </p>
     </div>
     <div class="menu">