[docs] Update the sections file
[docs] Update the sections file

The newly added symbols should also be added to the section file.

The CairoTexture section was referenced twice.

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