update MD by dispatch event pingcap/docs release-8.5

Author: github-actions

markdown-pages/en/tidbcloud/master/tidb-cloud/monitor-datadog-integration.md

@@ -24,7 +24,7 @@ TiDB Cloud has supported the project-level Datadog integration (Beta) since Marc
 
 ## Limitation
 
-- You cannot use the Datadog integration in [TiDB Cloud Starter](/tidb-cloud/select-cluster-tier.md#tidb-cloud-serverless) or [TiDB Cloud Essential](/tidb-cloud/select-cluster-tier.md#essential) clusters.
+- Datadog integrations are now only available for [TiDB Cloud Dedicated](/tidb-cloud/select-cluster-tier.md#tidb-cloud-dedicated) clusters.
 
 - Datadog integrations are not available when the cluster status is **CREATING**, **RESTORING**, **PAUSED**, or **RESUMING**.