message: docs(aio): fix HttpClient setting new header sample
diff: @@ -352,7 +352,7 @@ A common use of interceptors is to set default headers on outgoing responses. Fo
  ```javascript
  import {Injectable} from '@angular/core';
  -import {HttpEvent, HttpInterceptor, HttpHandler, HttpRequest) from '@angular/common/http';
  +import {HttpEvent, HttpInterceptor, HttpHandler, HttpRequest} from '@angular/common/http';
  @Injectable()
  export class AuthInterceptor implements HttpInterceptor {
  