Clean up the javadoc to pass java 8's doclint

By: Thinkofdeath <thinkofdeath@spigotmc.org>

paper-api/src/main/java/org/bukkit/event/vehicle/VehicleDamageEvent.java

@@ -48,6 +48,8 @@ public class VehicleDamageEvent extends VehicleEvent implements Cancellable {
      * This method exists for legacy reasons to provide backwards
      * compatibility. It will not exist at runtime and should not be used
      * under any circumstances.
+     * 
+     * @return the damage
      */
     @Deprecated
     public int _INVALID_getDamage() {
@@ -67,6 +69,8 @@ public class VehicleDamageEvent extends VehicleEvent implements Cancellable {
      * This method exists for legacy reasons to provide backwards
      * compatibility. It will not exist at runtime and should not be used
      * under any circumstances.
+     * 
+     * @param damage the damage
      */
     @Deprecated
     public void _INVALID_setDamage(int damage) {