Fix NA URL.

Author: kring

lib/Views/RelatedMaps.html

@@ -15,12 +15,12 @@ <h2><a href="http://nationalmap.gov.au/renewables/">AREMI</a></h2>
     </tr>
     <tr>
         <td>
-            <a href="http://nationalmap.gov.au/northernaustralia">
+            <a href="http://nationalmap.gov.au/northernaustralia/">
                 <img src="images/northernaustralia.jpg" width="200" height="150" alt="Northern Australia" />
             </a>
         </td>
         <td>
-            <h2><a href="http://nationalmap.gov.au/northernaustralia">Northern Australia</a></h2>
+            <h2><a href="http://nationalmap.gov.au/northernaustralia/">Northern Australia</a></h2>
             The Northern Australia NationalMap forms part of the Government's commitment to developing northern Australia by providing easy access to authoritative and other spatial data on northern Australia to governments, business and the public.
 
 More information on the Government's White Paper on Developing Northern Australia is available here:  https://northernaustralia.dpmc.gov.au