Update OpenTelemetry_OPEA_Guide.rst

Author: louie-tsai

tutorial/OpenTelemetry/OpenTelemetry_OPEA_Guide.rst

@@ -76,7 +76,7 @@ If a service is marked as "down," Grafana Dashboards will be unable to display t
   :width: 800
   :alt: Alternative text
 
-Grafana
+2. Grafana
 +++++++++++++++
 
 The Grafana UI displays telemetry metrics through pre-defined dashboards, providing a clear visualization of data. 
@@ -110,7 +110,7 @@ These sections offer insights into how to interpret the data and utilize the das
    ChatQnA <deploy/ChatQnA>
 
 
-Jaeger
+3. Jaeger
 +++++++++++++++
 
 The Jaeger UI is instrumental in understanding function tracing for each request, providing visibility into the execution flow and timing of microservices.