[docs] Add ClutterPath unused symbols
[docs] Add ClutterPath unused symbols

Add the symbols that gtk-doc can track to the sections file.

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