add comment for `initDefaultComponents` override
add comment for `initDefaultComponents` override

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