docs(router): fix UrlHandlingStrategy guide link

The @see link pointed to the preloading strategies section of the guide instead of the URL handling strategy one.

(cherry picked from commit deade10)

Author: aminesbdev

packages/router/src/url_handling_strategy.ts

@@ -15,7 +15,7 @@ import {UrlTree} from './url_tree';
  *
  * Provides a way to migrate AngularJS applications to Angular.
  *
- * @see [URL handling strategy](guide/routing/customizing-route-behavior#built-in-preloading-strategies)
+ * @see [URL handling strategy](guide/routing/customizing-route-behavior#url-handling-strategy)
  *
  * @publicApi
  */