Add Override annotations where appropriate

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

paper-api/src/main/java/org/bukkit/OfflinePlayer.java

@@ -25,6 +25,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      *
      * @return Player name or null if we have not seen a name for this player yet
      */
+    @Override
     @Nullable
     public String getName();
 
@@ -33,6 +34,7 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
      *
      * @return Player UUID
      */
+    @Override
     @NotNull
     public UUID getUniqueId();