fix dynamic bone animations

lib/animations/bone_animation_data.dart

@@ -5,6 +5,7 @@ import 'package:vector_math/vector_math.dart';
 /// Model class for bone animation frame data.
 /// To create dynamic/runtime bone animations (as distinct from animations embedded in a glTF asset), create an instance containing the relevant
 /// data and pass to the [setBoneAnimation] method on a [FilamentController].
+/// [frameData] is laid out as [locX, locY, locZ, rotW, rotX, rotY, rotZ]
 ///
 class BoneAnimationData {
   final String boneName;