minor improvement on comments

Author: WilliamBergamin

slack_bolt/middleware/assistant/assistant.py

@@ -242,7 +242,7 @@ def process(  # type: ignore[return]
                             if middleware_resp is not None:
                                 return middleware_resp
                             # The listener middleware didn't call next().
-                            # This means the listener is not for this incoming request.
+                            # Skip this listener and try the next one.
                             continue
                         if middleware_resp is not None:
                             resp = middleware_resp

slack_bolt/middleware/assistant/async_assistant.py

@@ -271,7 +271,7 @@ async def async_process(  # type: ignore[return]
                             if middleware_resp is not None:
                                 return middleware_resp
                             # The listener middleware didn't call next().
-                            # This means the listener is not for this incoming request.
+                            # Skip this listener and try the next one.
                             continue
                         if middleware_resp is not None:
                             resp = middleware_resp