Describe the problem that you experienced

We haven't added docs on how to use ErrorHandler without NgModules https://angular.dev/api/core/ErrorHandler?tab=usage-notes

Add documentation on how to use ErrorHandler without NgModules in the app config:

export const appConfig: ApplicationConfig = {
  providers: [
    provideRouter(routes),
    { provide: ErrorHandler, useClass: GlobalHandler },
  ],
};