Fixed broken (deprecated) link to XHRLoader in three.js docs (#2362)
Fixed broken (deprecated) link to XHRLoader in three.js docs (#2362)

...and replaced all mentions of 'XHRLoader / THREE.XHRLoader' with 'FileLoader / THREE.FileLoader'
dmarcos/aframe,mkungla/aframe,RSpace/aframe,chenzlabs/aframe,jaxmolina/ar,wizgrav/aframe,weddingdj/aframe,weddingdj/aframe,jaxmolina/ar,wizgrav/aframe,darkwing/aframe,googlecreativelab/aframe,ngokevin/aframe,aframevr/aframe,aframevr/aframe,fernandojsg/aframe,dmarcos/aframe,RSpace/aframe,ngokevin/aframe,mkungla/aframe,chenzlabs/aframe,fernandojsg/aframe,googlecreativelab/aframe,darkwing/aframe