message: docs: add link to component-less routes description.
  Currently it's not clear what a component-less route is. Add a link to  make it clear
  PR Close
diff: @@ -371,7 +371,7 @@ The following route guards are available in Angular:
  * [`Resolve`](api/router/Resolve)
  * [`CanLoad`](api/router/CanLoad)
  -To use route guards, consider using component-less routes as this facilitates guarding child routes.
  +To use route guards, consider using [component-less routes](api/router/Route#componentless-routes) as this facilitates guarding child routes.
  Create a service for your guard:
  