message: docs: fix HttpClient sample
diff: @@ -50,7 +50,10 @@ The `get()` method on `HttpClient` makes accessing this data straightforward.
  ```javascript
  @Component(...)
  -export class MyComponent implements NgOnInit {
  +export class MyComponent implements OnInit {
  +
  + results: string[];
  +
  // Inject HttpClient into your component or service.
  constructor(private http: HttpClient) {}
  