Update opentelemetry-best-practices-resources.mdx

src/content/docs/opentelemetry/best-practices/opentelemetry-best-practices-resources.mdx

@@ -146,6 +146,8 @@ The memcacahed cluster entity to which the service is connecting should have the
 * `aws.elasticache.configurationEndpointAddress` or `aws.elasticache.endpointAddress`: AWS connection endpoint of the memcached cluster matching with the span attribute `net.peer.name` of the service.
 * `aws.elasticache.configurationEndpointPort` or `aws.elasticache.endpointPort`: Port number on which memcached cluster is running matching with the span attribute `net.peer.port` of the service.
 
+If the above condition is met, the service map shows the service calling instrumented memcached cluster. If the condition is not met, the service map shows the service calling uninstrumented external service
+
 ## Adding custom tags to an entity [#tags]
 
 You can use tags to organize and filter your entities in the UI.