Update trigger comment

Co-authored-by: kimi <47579703+kimi-p@users.noreply.github.com>

Author: avedmala

datadog_lambda/trigger.py

@@ -256,7 +256,7 @@ def parse_event_source_arn(source: _EventSource, event: dict, context: Any) -> s
     if source.event_type == EventTypes.CLOUDWATCH_EVENTS and event.get("resources"):
         return event.get("resources")[0]
 
-    # e.g. arn:aws:states:us-east-1:123456789012:stateMachine:stateMachineName
+    # Returning state machine arn as event source arn.
     if source.event_type == EventTypes.STEPFUNCTIONS:
         context = event
         if "_datadog" in event: