message: docs(router): fix typo
diff: @@ -70,7 +70,7 @@ import {UrlTree} from '../url_tree';
  *
  * You can tell the directive to how to handle queryParams, available options are:
  * - 'merge' merge the queryParams into the current queryParams
  - * - 'preserve' prserve the current queryParams
  + * - 'preserve' preserve the current queryParams
  * - default / '' use the queryParams only
  * same options for {@link NavigationExtras#queryParamsHandling}
  *
  