fixed screenshot for camelHump in navigation popup feature

platform/platform-resources-en/src/tips/CamelPrefixesInNavigationPopups.html

@@ -6,7 +6,7 @@
       <font style="font-family: Verdana; font-weight:bold;" size="3" color="#005555">Go to Symbol</font>, or
       <font style="font-family: Verdana; font-weight:bold;" size="3" color="#005555">Go to File</font> popup,
       you can ease the search by filtering the lookup list with the help of the &quot;camel words&quot; prefixes.
-      <p><img hspace="20" src="images/camel_goto.gif"></p>
+      <p><img hspace="20" src="images/camel_goto.png"></p>
     </td>
   </tr>
 </table>