[docs] Fix a missing parameter
[docs] Fix a missing parameter

Distrotech/cogl,gcampax/cogl,Distrotech/cogl,collects/cogl,Distrotech/cogl,collects/cogl,spatulasnout/cogl,djdeath/cogl,djdeath/cogl,gcampax/cogl,gcampax/cogl,Distrotech/cogl,djdeath/cogl-android,djdeath/cogl-android,djdeath/cogl,djdeath/cogl-android,spatulasnout/cogl,gcampax/cogl