docs: Add unused symbols to the Clutter API reference
docs: Add unused symbols to the Clutter API reference

spatulasnout/clutter,collects/clutter,djdeath/clutter-multithreaded,collects/clutter,GNOME/clutter,Distrotech/clutter,heysion/clutter-clone,Distrotech/clutter,spatulasnout/clutter,jigpu/clutter,dlespiau/clutter,GNOME/clutter,heysion/clutter-clone,collects/clutter,Distrotech/clutter,Distrotech/clutter,Distrotech/clutter,djdeath/clutter-android,djdeath/clutter,ebassi/clutter,djdeath/clutter-android,collects/clutter,djdeath/clutter-android,GNOME/clutter,djdeath/clutter,jigpu/clutter,jigpu/clutter,ebassi/clutter,djdeath/clutter,djdeath/clutter-multithreaded,jigpu/clutter,kerrickstaley/clutter-vala,djdeath/clutter,kerrickstaley/clutter-vala,djdeath/clutter-android,spatulasnout/clutter,GNOME/clutter,heysion/clutter-clone,GNOME/clutter,dlespiau/clutter,collects/clutter,jigpu/clutter,kerrickstaley/clutter-vala,djdeath/clutter,djdeath/clutter,dlespiau/clutter,ebassi/clutter,nobled/clutter,spatulasnout/clutter,djdeath/clutter-android,Distrotech/clutter,ebassi/clutter,nobled/clutter,spatulasnout/clutter,kerrickstaley/clutter-vala,nobled/clutter,ebassi/clutter,djdeath/clutter-multithreaded,jigpu/clutter,heysion/clutter-clone,heysion/clutter-clone,djdeath/clutter-multithreaded