Update gtk-doc 'Since' field for cogl_texture_multiple_rectangles
Update gtk-doc 'Since' field for cogl_texture_multiple_rectangles

The function has been backported to the 0.8 branch so it will also be
available in Clutter 0.8.6

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