Adjust the speed of Texture 2D array example

examples/webgl2_materials_texture2darray.html

@@ -96,7 +96,7 @@
 			var planeWidth = 50;
 			var planeHeight = 50;
 
-			var depthStep = 0.5;
+			var depthStep = 0.4;
 
 			init();
 			animate();