adding java doc tags

#story[782]

visualiser/src/main/java/seng302/Mock/StreamedRace.java

@@ -92,6 +92,11 @@ public class StreamedRace extends Race {
         }
     }
 
+    /**
+     * sets the position of a boat from coordinate
+     * @param boat the boat to set
+     * @param coordinate the position of the boat
+     */
     protected void setPosition(Boat boat, GPSCoordinate coordinate) {
         boat.setCurrentPosition(coordinate);
     }