Correct comments in App/AsyncApp

Author: seratch

slack_bolt/app/app.py

@@ -514,7 +514,7 @@ def message(
         def __call__(*args, **kwargs):
             functions = self._to_listener_functions(kwargs) if kwargs else list(args)
             # As of Jan 2021, most bot messages no longer have the subtype bot_message.
-            # By contrast, messages posted using class app's bot token still have the subtype.
+            # By contrast, messages posted using classic app's bot token still have the subtype.
             constraints = {"type": "message", "subtype": (None, "bot_message")}
             primary_matcher = builtin_matchers.event(constraints=constraints)
             middleware.insert(0, MessageListenerMatches(keyword))

slack_bolt/app/async_app.py

@@ -562,7 +562,7 @@ def message(
         def __call__(*args, **kwargs):
             functions = self._to_listener_functions(kwargs) if kwargs else list(args)
             # As of Jan 2021, most bot messages no longer have the subtype bot_message.
-            # By contrast, messages posted using class app's bot token still have the subtype.
+            # By contrast, messages posted using classic app's bot token still have the subtype.
             constraints = {"type": "message", "subtype": (None, "bot_message")}
             primary_matcher = builtin_matchers.event(
                 constraints=constraints, asyncio=True