message: docs: fix test description to match code example
  PR Close
diff: @@ -1190,7 +1190,7 @@ Call `request.flush()` with an error message, as seen in the following example.
  region="404">
  </code-example>
  -Alternatively, call `request.error()` with an `ErrorEvent`.
  +Alternatively, call `request.error()` with a `ProgressEvent`.
  <code-example
  path="http/src/testing/http-client.spec.ts"
  