message: docs: fix shadow variable in tutorial example
  PR Close
diff: @@ -97,7 +97,7 @@ export class HeroService {
  /** POST: add a new hero to the server */
  addHero (hero: Hero): Observable<Hero> {
  return this.http.post<Hero>(this.heroesUrl, hero, httpOptions).pipe(
  - tap((hero: Hero) => this.log(`added hero w/ id=${hero.id}`)),
  + tap((newHero: Hero) => this.log(`added hero w/ id=${newHero.id}`)),
  catchError(this.handleError<Hero>('addHero'))
  );
  }
  