updated appd link (open-telemetry#2192)

Author: saurabhdes

README.md

@@ -110,7 +110,7 @@ Emeritus:
 <!-- Links for Demos featuring the Astronomy Shop section -->
 
 [AlibabaCloud LogService]: https://github.com/aliyun-sls/opentelemetry-demo
-[AppDynamics]: https://community.appdynamics.com/t5/Knowledge-Base/How-to-observe-OpenTelemetry-demo-app-in-Splunk-AppDynamics/ta-p/58584
+[AppDynamics]: https://community.splunk.com/t5/AppDynamics-Knowledge-Base/How-to-observe-Kubernetes-deployment-of-OpenTelemetry-demo-app/ta-p/741454
 [Aspecto]: https://github.com/aspecto-io/opentelemetry-demo
 [Axiom]: https://play.axiom.co/axiom-play-qf1k/dashboards/otel.traces.otel-demo-traces
 [Axoflow]: https://axoflow.com/opentelemetry-support-in-more-detail-in-axosyslog-and-syslog-ng/