feat(examples): Updated simple layers example with Mapbox maps

examples/layers-simple-example.html

@@ -31,7 +31,7 @@
                             name: 'Mapbox Terrain',
                             url: 'http://api.tiles.mapbox.com/v4/{mapid}/{z}/{x}/{y}.png?access_token={apikey}',
                             type: 'xyz',
-                            options: {
+                            layerOptions: {
                                 apikey: 'pk.eyJ1IjoidG9tYmF0b3NzYWxzIiwiYSI6Imo3MWxyTHMifQ.TjXg_IV7ZYMHX6tqjMikPg',
                                 mapid: 'tombatossals.jbn2nnon'
                             }