Add Override annotations where appropriate

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/entity/EnderDragonPart.java

@@ -6,6 +6,7 @@ import org.jetbrains.annotations.NotNull;
  * Represents an ender dragon part
  */
 public interface EnderDragonPart extends ComplexEntityPart, Damageable {
+    @Override
     @NotNull
     public EnderDragon getParent();
 }

paper-api/src/main/java/org/bukkit/entity/Entity.java

@@ -223,6 +223,7 @@ public interface Entity extends Metadatable, CommandSender, Nameable, Persistent
      *
      * @return Server instance running this Entity
      */
+    @Override
     @NotNull
     public Server getServer();
 

paper-api/src/main/java/org/bukkit/entity/Player.java

@@ -138,6 +138,7 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
      *
      * @param message Message to be displayed
      */
+    @Override
     public void sendRawMessage(@NotNull String message);
 
     /**

paper-api/src/main/java/org/bukkit/entity/Vehicle.java

@@ -13,6 +13,7 @@ public interface Vehicle extends Entity {
      *
      * @return velocity vector
      */
+    @Override
     @NotNull
     public Vector getVelocity();
 
@@ -21,5 +22,6 @@ public interface Vehicle extends Entity {
      *
      * @param vel velocity vector
      */
+    @Override
     public void setVelocity(@NotNull Vector vel);
 }