add docs for Application.setSkybox
add docs for Application.setSkybox

sereepap2029/playcanvas,sereepap2029/playcanvas,guycalledfrank/engine,aidinabedi/playcanvas-engine,MicroWorldwide/PlayCanvas,H1Gdev/engine,MicroWorldwide/PlayCanvas,playcanvas/engine,playcanvas/engine,sereepap2029/playcanvas,guycalledfrank/engine,H1Gdev/engine,aidinabedi/playcanvas-engine