message: docs: unified string chaining
  PR Close
diff: @@ -151,7 +151,7 @@ export class HeroService {
  // #docregion log
  /** Log a HeroService message with the MessageService */
  private log(message: string) {
  - this.messageService.add('HeroService: ' + message);
  + this.messageService.add(`HeroService: ${message}`);
  }
  // #enddocregion log
  }
  