doc(api): fix invalid doc links (#9873)

Errors were reported during API doc generation.

modules/@angular/router/src/router.ts

@@ -113,7 +113,7 @@ export type Event = NavigationStart | NavigationEnd | NavigationCancel | Navigat
 /**
  * The `Router` is responsible for mapping URLs to components.
  *
- * See {@link Routes) for more details and examples.
+ * See {@link Routes} for more details and examples.
  *
  * @stable
  */

modules/@angular/router/src/url_tree.ts

@@ -159,12 +159,12 @@ export function mapChildrenIntoArray<T>(
  */
 export abstract class UrlSerializer {
   /**
-   * Parse a url into a {@Link UrlTree}
+   * Parse a url into a {@link UrlTree}
    */
   abstract parse(url: string): UrlTree;
 
   /**
-   * Converts a {@Link UrlTree} into a url
+   * Converts a {@link UrlTree} into a url
    */
   abstract serialize(tree: UrlTree): string;
 }