Update real-time-transcription-csharp.md

add additional headers

Author: valindrae

articles/communication-services/how-tos/call-automation/includes/real-time-transcription-csharp.md

@@ -67,6 +67,9 @@ await callMedia.StartTranscriptionAsync(options);
 // await callMedia.StartTranscriptionAsync();
 ```
 
+### Additional Headers:
+ The Correlation ID and Call Connection ID are now included in the WebSocket headers for improved traceability `x-ms-call-correlation-id` and `x-ms-call-connection-id`.
+
 ## Receiving Transcription Stream
 When transcription starts, your websocket receives the transcription metadata payload as the first packet.