added missing toString javadoc for ships

src/Ship/CargoShip.java

@@ -26,6 +26,10 @@ public class CargoShip extends Ship {
         return maxTonnage;
     }
 
+    /**
+     * Returns string representation of Cargo Ship object, including name and max cargo tonnage
+     * @return String representation of object
+     */
     @Override
     public String toString() {
         return "Cargo Ship " + name + ". Max Tonnage: " + maxTonnage;

src/Ship/CruiseShip.java

@@ -30,6 +30,10 @@ public class CruiseShip extends Ship {
         return maxPassengers;
     }
 
+    /**
+     * Returns string representation of the Cruise Ship object, printing the name and max passengers
+     * @return String representation of object
+     */
     @Override
     public String toString() {
         return "Cruise Ship " + name + ". Max passengers: " + maxPassengers;