Update ChatQnA.md

Author: louie-tsai

tutorial/OpenTelemetry/deploy/ChatQnA.md

@@ -93,7 +93,7 @@ allowing for a more comprehensive understanding of the ChatQnA application's ove
 
 ![chatqna_1req](../assets/Grafana_chatqna_retriever.png)
 
-### ChatQnA MegaService Dashboard
+### LLM Dashboard
 
 This dashboard presents metrics for the LLM service, including key performance indicators such as request latency, time per output token latency,   
 and time to first token latency, among others.