Add ToC entry

Author: jlian

articles/iot-operations/toc.yml

@@ -178,6 +178,9 @@ items:
         - name: Azure Data Explorer
           href: connect-to-cloud/howto-configure-adx-endpoint.md
           displayName: data flow, endpoint, northbound
+        - name: OpenTelemetry
+          href: connect-to-cloud/howto-configure-opentelemetry-endpoint.md
+          displayName: data flow, endpoint, observability, metrics, logs, OpenTelemetry, OTLP, northbound
         - name: Local storage or ACSA
           href: connect-to-cloud/howto-configure-local-storage-endpoint.md
           displayName: data flow, endpoint, northbound