message: docs(router): fix error handler deprecation
  The deprecation mentions `withErrorHandler` whereas the feature is called `withNavigationErrorHandler` since
  PR Close
diff: @@ -179,8 +179,8 @@ export class Router {
  * A handler for navigation errors in this NgModule.
  *
  * @deprecated Subscribe to the `Router` events and watch for `NavigationError` instead.
  - * `provideRouter` has the `withErrorHandler` feature to make this easier.
  - * @see `withErrorHandler`
  + * `provideRouter` has the `withNavigationErrorHandler` feature to make this easier.
  + * @see `withNavigationErrorHandler`
  */
  errorHandler = this.options.errorHandler || defaultErrorHandler;
  