docs: Add missing sections to the Clutter API reference
docs: Add missing sections to the Clutter API reference

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