[docs] Fix updating three.js box's color
[docs] Fix updating three.js box's color

Error detail: Failed to execute 'uniform3fv' on 'WebGLRenderingContext': No function was found that matched the signature provided
ngokevin/aframe,RSpace/aframe,aframevr/aframe,aframevr/aframe,chenzlabs/aframe,chenzlabs/aframe,ngokevin/aframe,dmarcos/aframe,dmarcos/aframe,RSpace/aframe