docs(common): info on where static assets are

Author: marin-bratanov

getting-started/what-you-need.md

@@ -65,7 +65,7 @@ To have the Telerik Blazor components look and behave as expected in the browser
 
 ### Static Assets
 
-You can add the JS Interop file as a static asset from our package, instead of using a CDN. [Static assets](https://github.com/aspnet/AspNetCore/issues/6349) (the `_content` folder) are automatically included in the solution by the Nuget package, so all that's needed is then to reference the asset:
+You can add the JS Interop file as a static asset from our package, instead of using a CDN. [Static assets](https://github.com/aspnet/AspNetCore/issues/6349) (the `_content` folder) are automatically included in the solution by the Nuget package, so all that's needed is then to reference the asset as shown below. The `_content` folder is expanded by the framework into the local nuget cache, and the project copies it from there.
 
     **HTML**