[docs] add example for utils.throttle
[docs] add example for utils.throttle

googlecreativelab/aframe,chenzlabs/aframe,dmarcos/aframe,wizgrav/aframe,aframevr/aframe,mkungla/aframe,dmarcos/aframe,aframevr/aframe,RSpace/aframe,wizgrav/aframe,googlecreativelab/aframe,RSpace/aframe,weddingdj/aframe,ngokevin/aframe,weddingdj/aframe,ngokevin/aframe,chenzlabs/aframe,mkungla/aframe