clean up material event docs
clean up material event docs

chenzlabs/aframe,fernandojsg/aframe,msimpson/aframe,dmarcos/aframe,weddingdj/aframe,darkwing/aframe,dmarcos/aframe,weddingdj/aframe,wizgrav/aframe,ngokevin/aframe,googlecreativelab/aframe,darkwing/aframe,mkungla/aframe,RSpace/aframe,fernandojsg/aframe,chenzlabs/aframe,jaxmolina/ar,jzitelli/aframe,googlecreativelab/aframe,ngokevin/aframe,mkungla/aframe,MatthewShotton/aframe,aframevr/aframe,jzitelli/aframe,msimpson/aframe,wizgrav/aframe,RSpace/aframe,aframevr/aframe,MatthewShotton/aframe,jaxmolina/ar