core/transformation: Correct annotation on return value of action

Author: zml2008

core/src/main/java/org/spongepowered/configurate/transformation/TransformAction.java

@@ -130,6 +130,6 @@ static <V> TransformAction set(Class<V> type, Supplier<V> valueSupplier) {
      * @return a modified path, or null if the path is to stay the same
      * @since 4.0.0
      */
-    @Nullable Object @Nullable[] visitPath(NodePath path, ConfigurationNode value) throws ConfigurateException;
+    Object @Nullable[] visitPath(NodePath path, ConfigurationNode value) throws ConfigurateException;
 
 }