Update RoomEnvironment.js

Remove redundant link.

examples/jsm/environments/RoomEnvironment.js

@@ -1,7 +1,3 @@
-/**
- * https://github.com/google/model-viewer/blob/master/packages/model-viewer/src/three-components/EnvironmentScene.ts
- */
-
 import {
  	BackSide,
  	BoxGeometry,