message: docs: clarify documentation about listening to progress events
  PR Close
diff: @@ -865,6 +865,9 @@ with the `reportProgress` option set true to enable tracking of progress events.
  Every progress event triggers change detection, so only turn them on if you truly intend to report progress in the UI.
  +When using [`HttpClient#request()`](api/common/http/HttpClient#request) with an HTTP method, configure with
  +[`observe: 'events'`](api/common/http/HttpClient#request) to see all events, including the progress of transfers.
  +
  </div>
  Next, pass this request object to the `HttpClient.request()` method, which
  