fix typo error

examples/webgl_materials_cubemap_mipmaps.html

@@ -28,7 +28,7 @@
 			init();
 			animate();
 
-			//load custmized cube texture
+			//load customized cube texture
 			async function loadCubeTextureWithMipmaps() {
 
 				var path = 'textures/cube/angus/';