[docs] Remove ClutterLabel and ClutterEntry sections
[docs] Remove ClutterLabel and ClutterEntry sections

Remove the sections for the Label and the Entry actors, which
have been replaced by ClutterText.

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