Adjust documentation comment of AssetContainer.addAllAssetsToContainer (#17405)

As far as I can tell, this does not actually add animation groups to the
asset container.

Author: kv-bh

packages/dev/core/src/assetContainer.ts

@@ -1265,7 +1265,7 @@ export class AssetContainer extends AbstractAssetContainer {
 
     /**
      * @since 6.26.0
-     * Given a root asset, this method will traverse its hierarchy and add it, its children and any materials/skeletons/animation groups to the container.
+     * Given a root asset, this method will traverse its hierarchy and add it, its children and any materials/skeletons to the container.
      * @param root root node
      */
     public addAllAssetsToContainer(root: Node) {