message: docs: update api reference for router outlet directive
  Incorporate more specific information about multiple outlets and how to target them, with link to tutorial example.
  PR Close
diff: @@ -27,6 +27,21 @@ import {PRIMARY_OUTLET} from '../shared';
  * <router-outlet name='right'></router-outlet>
  * ```
  *
  + * Named outlets can be the targets of secondary routes.
  + * The `Route` object for a secondary route has an `outlet` property to identify the target outlet:
  + *
  + * `{path: <base-path>, component: <component>, outlet: <target_outlet_name>}`
  + *
  + * Using named outlets and secondary routes, you can target multiple outlets in
  + * the same `RouterLink` directive.
  + *
  + * The router keeps track of separate branches in a navigation tree for each named outlet and
  + * generates a representation of that tree in the URL.
  + * The URL for a secondary route uses the following syntax to specify both the primary and secondary
  + * routes at the same time:
  + *
  + * `http://base-path/primary-route-path(outlet-name:route-path)`
  + *
  * A router outlet emits an activate event when a new component is instantiated,
  * and a deactivate event when a component is destroyed.
  *
  @@ -35,6 +50,11 @@ import {PRIMARY_OUTLET} from '../shared';
  * (activate)='onActivate($event)'
  * (deactivate)='onDeactivate($event)'></router-outlet>
  * ```
  + *
  + * @see [Routing tutorial](guide/router-tutorial-toh#named-outlets "Example of a named
  + * outlet and secondary route configuration").
  + * @see `RouterLink`
  + * @see `Route`
  * @ngModule RouterModule
  *
  * @publicApi
  