Update error message

src/stepfunctions/steps/states.py

@@ -597,7 +597,7 @@ def __init__(self, state_id, **kwargs):
             raise ValueError("Only one of 'timeout_seconds' or 'timeout_seconds_path' can be provided.")
 
         if self.heartbeat_seconds is not None and self.heartbeat_seconds_path is not None:
-            raise ValueError("The Task state can contain at most one of 'heartbeat_seconds' or 'heartbeat_seconds_path'.")
+            raise ValueError("Only one of 'heartbeat_seconds' or 'heartbeat_seconds_path' can be provided.")
 
     def allowed_fields(self):
         return [