message: avoid confusing drainer name in docs
diff: @@ -248,7 +248,7 @@ where
  /// let context = Context::new(()); // bad empty context - put client in here
  /// let cmgs = Api::<ConfigMapGenerator>::all(client.clone());
  /// let cms = Api::<ConfigMap>::all(client.clone());
  -/// let drainer = Controller::new(cmgs, ListParams::default())
  +/// Controller::new(cmgs, ListParams::default())
  /// .owns(cms, ListParams::default())
  /// .run(reconcile, error_policy, context)
  /// .for_each(|res| async move {
  @@ -256,8 +256,8 @@ where
  /// Ok(o) => println!("reconciled {:?}", o),
  /// Err(e) => println!("reconcile failed: {:?}", e),
  /// }
  -/// });
  -/// drainer.await; // reconciler does nothing unless polled
  +/// })
  +/// .await; // controller does nothing unless polled
  /// Ok(())
  /// }
  /// ```
  