Add Override annotations where appropriate

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

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

@@ -599,6 +599,7 @@ public class Location implements Cloneable, ConfigurationSerializable {
         return NumberConversions.floor(loc);
     }
 
+    @Override
     @Utility
     @NotNull
     public Map<String, Object> serialize() {