docs: Improve deprecation notices for ClutterBox
docs: Improve deprecation notices for ClutterBox

Distrotech/clutter,GNOME/clutter,GNOME/clutter,Distrotech/clutter,GNOME/clutter,Distrotech/clutter,Distrotech/clutter,jigpu/clutter,Distrotech/clutter,jigpu/clutter,GNOME/clutter,jigpu/clutter,Distrotech/clutter,jigpu/clutter,jigpu/clutter,GNOME/clutter,jigpu/clutter