Added note on Spine 2.x compatibility

docs/en/manuals/spine.md

@@ -15,6 +15,10 @@ Defold supports most of Spine's animation features, including inverse kinematics
 Currently, Defold does not support animation keys that flip bones over the X or Y axis. Defold supports mesh animation but only with bones, meaning that you can't animate single vertices. If you need to animate single vertices you can do that through a bone being 100% bound to that vertex only and animate the bone.
 :::
 
+::: important
+The Spine runtime implementation in Defold supports all Spine 2.x features. The runtime provides only limited additional support for Spine 3.x features. Make sure to use only Spine 2.x features to ensure compatibility with the Defold runtime!
+:::
+
 ## Concepts
 
 *Spine JSON data file*