Remove APM agent key API page

Author: lcawl

solutions/observability/apps/apm-agent-key-api.md

@@ -13,7 +13,7 @@ Some Applications UI features are provided via a REST API:
 * Agent Configuration API ([{{stack}}](https://www.elastic.co/docs/api/doc/kibana/group/endpoint-apm-agent-configuration) or [{{serverless-short}}](https://www.elastic.co/docs/api/doc/serverless/group/endpoint-apm-agent-configuration))
 * Annotation API ([{{stack}}](https://www.elastic.co/docs/api/doc/kibana/group/endpoint-apm-annotations) or [{{serverless-short}}](https://www.elastic.co/docs/api/doc/serverless/group/endpoint-apm-annotations))
 * [RUM source map API](rum-source-map-api.md)
-* [APM agent Key API](apm-agent-key-api.md)
+* APM agent key API ([{{stack}}](https://www.elastic.co/docs/api/doc/kibana/group/endpoint-apm-agent-keys) or [{{serverless-short}}](https://www.elastic.co/docs/api/doc/serverless/group/endpoint-apm-agent-keys))
 
 
 ## Using the APIs [apm-api-example] 

solutions/observability/apps/apm-ui-api.md

@@ -166,7 +166,6 @@ toc:
                   - file: observability/apps/apm-ui-api.md
                     children:
                       - file: observability/apps/rum-source-map-api.md
-                      - file: observability/apps/apm-agent-key-api.md
                       - file: observability/apps/managed-intake-service-event-api.md
                   - file: observability/apps/apm-server-api.md
                     children: