message: docs: update HTTP error test example again
  This has somehow regressed since angular/angular#22844 was merged.
  PR Close
diff: @@ -1034,7 +1034,7 @@ Call `request.flush()` with an error message, as seen in the following example.
  <code-example
  path="http/src/testing/http-client.spec.ts"
  - region="network-error"
  + region="404"
  linenums="false">
  </code-example>
  