message: docs: fix type error in HttpClient sample
diff: @@ -73,7 +73,7 @@ You can, however, tell `HttpClient` what type the response will be, which is rec
  To do so, first you define an interface with the correct shape:
  ```javascript
  -interface DevelopersResponse {
  +interface ItemsResponse {
  results: string[];
  }
  ```
  