Add some hints to generic loader registry about replacements for IHav…

…eLoader

Thats probably the most awkward part of the migration, as IAmLoadable.Record cannot just extend this due to generic differences.

src/main/java/slimeknights/mantle/data/registry/GenericLoaderRegistry.java

@@ -148,9 +148,15 @@ public interface IGenericLoader<T> {
     void toNetwork(T object, FriendlyByteBuf buffer);
   }
 
-  /** Interface for an object with a loader */
+  /**
+   * Interface for an object with a loader.
+   * TODO 1.20: replace with {@link slimeknights.mantle.data.loadable.IAmLoadable.Record}
+   */
   public interface IHaveLoader {
-    /** Gets the loader for the object */
+    /**
+     * Gets the loader for the object.
+     * If you wish to suppress the deprecation warning, change the return type to {@link slimeknights.mantle.data.loadable.record.RecordLoadable}.
+     */
     IGenericLoader<? extends IHaveLoader> getLoader();
   }