update mixin docs to have assets within the scene
update mixin docs to have assets within the scene

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