message: fix(router): relax nullability requirements
diff: @@ -78,7 +78,7 @@ export interface NavigationExtras {
  * }
  * ```
  */
  - relativeTo?: ActivatedRoute;
  + relativeTo?: ActivatedRoute|null;
  /**
  * Sets query parameters to the URL.
  @@ -88,7 +88,7 @@ export interface NavigationExtras {
  * this.router.navigate(['/results'], { queryParams: { page: 1 } });
  * ```
  */
  - queryParams?: Params;
  + queryParams?: Params|null;
  /**
  * Sets the hash fragment for the URL.
  @@ -122,7 +122,7 @@ export interface NavigationExtras {
  * this.router.navigate(['/view'], { queryParams: { page: 2 }, queryParamsHandling: "merge" });
  * ```
  */
  - queryParamsHandling?: QueryParamsHandling;
  + queryParamsHandling?: QueryParamsHandling|null;
  /**
  * Preserves the fragment for the next navigation
  *
  