[docs] remove already-finished upcoming guide mention in basic guide
[docs] remove already-finished upcoming guide mention in basic guide

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