fix typo

Author: brianjester

okinawa-castles/central.html

@@ -676,7 +676,7 @@ <H4>Side Trip</H4>
               <H4>Maps - Zakimi Castle</H4>
               <img class="img-fluid" src="./zakimi/map1.jpg" alt="Zakimi Map Satellite">
               <BR><small>Map data ©2025 Google</small>
-              <img class="img-fluid" src="./zakimi/map2.png" alt="Zakimi Map Roads">
+              <img class="img-fluid" src="./zakimi/map2.jpg" alt="Zakimi Map Roads">
               <BR><small>Map data ©2025 Google</small>
 
               <H4>Overview - Zakimi Castle</H4>