Correct TODO text on test not running on EventsExecutor yet

I think I missed this one was trying to do async callbacks.

Signed-off-by: Brad Martin <[email protected]>

rclpy/test/test_executor.py

@@ -649,7 +649,7 @@ def test_multi_threaded_spin_once_until_future(self) -> None:
 
     def test_not_lose_callback(self) -> None:
         self.assertIsNotNone(self.node.handle)
-        # TODO(bmartin427) EventsExecutor has some kind of explosion here I haven't figured out yet
+        # TODO(bmartin427) EventsExecutor doesn't yet properly handle async callbacks
         executor = SingleThreadedExecutor(context=self.context)
 
         callback_group = ReentrantCallbackGroup()