[docs] fix script tag in basic guide
[docs] fix script tag in basic guide

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