Fix comment

Author: AnatoliB

azure/durable_functions/models/DurableOrchestrationContext.py

@@ -776,7 +776,7 @@ def version(self) -> str:
     @staticmethod
     def _extract_version_from_history(history_events: List[HistoryEvent]) -> str:
         """Extract the version from the execution started event in history.
-        
+
         Returns None if not found.
         """
         for event in history_events: