Updates OfflineGuide

Documentation/OfflineGuide/README.md

@@ -4,22 +4,22 @@ By default, Cesium uses several external data sources which require internet acc
 
 ## Imagery
 
-The default imagery provider in Cesium is Cesium ion global imagery through Bing Maps. This provider loads data from `api.cesium.com` and `dev.virtualearth.net` as well as several other tile servers that are subdomains of `virtualearth.net`. To use another provider, pass it into the constructor for the `Viewer` widget.
+The default imagery provider in Cesium is Cesium ion global imagery through Bing Maps. This provider loads data from `api.cesium.com` and `dev.virtualearth.net` as well as several other tile servers that are subdomains of `virtualearth.net`. To use another provider, pass it into the [constructor for the `Viewer` widget](https://cesium.com/learn/cesiumjs/ref-doc/Viewer.html#.ConstructorOptions).
 
 If you have an imagery server on your local network (e.g. WMS, ArcGIS, Google Earth Enterprise), you can configure Cesium to use that. Otherwise, Cesium ships with a low-resolution set of images from Natural Earth II in `Assets/Textures/NaturalEarthII`.
 
-By default, the `BaseLayerPicker` includes options for several sample online imagery and terrain sources. In an offline application, you should either disable that widget completely, by passing `baseLayerPicker : false` to the `Viewer` widget, or use the `imageryProviderViewModels` and `terrainProviderViewModels` options to configure the sources that will be available in your offline application.
+By default, the `BaseLayerPicker` includes options for several sample online imagery and terrain sources. In an offline application, you should either disable that widget completely, by passing `baseLayerPicker : false` to the `Viewer` widget's constructor, or use the `imageryProviderViewModels` and `terrainProviderViewModels` options to configure the sources that will be available in your offline application.
 
 ## Geocoder
 
-The `Geocoder` widget, which allows flying to addresses and landmarks, uses the Cesium ion API at `api.cesium.com`. In your offline application, you should disable this functionality by passing `geocoder : false` to the `Viewer` constructor.
+The [`Geocoder`](https://cesium.com/learn/cesiumjs/ref-doc/Geocoder.html?classFilter=geocoder) widget, which allows flying to addresses and landmarks, uses the Cesium ion API at `api.cesium.com`. In your offline application, you should disable this functionality by passing `geocoder : false` to the `Viewer` constructor.
 
 ## Example
 
 This example shows how to configure Cesium to avoid use of online data sources.
 
 ```javascript
-var viewer = new Cesium.Viewer("cesiumContainer", {
+const viewer = new Cesium.Viewer("cesiumContainer", {
   imageryProvider: new Cesium.TileMapServiceImageryProvider({
     url: Cesium.buildModuleUrl("Assets/Textures/NaturalEarthII"),
   }),