docs: update router to use @publicApi tags (#26595)

PR Close #26595

packages/router/src/router_state.ts

@@ -44,7 +44,7 @@ import {Tree, TreeNode} from './utils/tree';
  *
  * See `ActivatedRoute` for more information.
  *
- *
+ * @publicApi
  */
 export class RouterState extends Tree<ActivatedRoute> {
   /** @internal */
@@ -103,7 +103,7 @@ export function createEmptyStateSnapshot(
  * }
  * ```
  *
- *
+ * @publicApi
  */
 export class ActivatedRoute {
   /** The current snapshot of this route */
@@ -250,7 +250,7 @@ function flattenInherited(pathFromRoot: ActivatedRouteSnapshot[]): Inherited {
  * }
  * ```
  *
- *
+ * @publicApi
  */
 export class ActivatedRouteSnapshot {
   /** The configuration used to match this route **/
@@ -358,7 +358,7 @@ export class ActivatedRouteSnapshot {
  * }
  * ```
  *
- *
+ * @publicApi
  */
 export class RouterStateSnapshot extends Tree<ActivatedRouteSnapshot> {
   /** @internal */