fix

Author: shiyuhang0

TOC-tidb-cloud-essential.md

@@ -277,7 +277,7 @@
     - [Private Link Connection Overview](/tidb-cloud/serverless-private-link-connection.md)
     - [Connect to AWS RDS](/tidb-cloud/serverless-private-link-connection-to-aws-rds.md)
     - [Connect to Alibaba Cloud RDS](/tidb-cloud/serverless-private-link-connection-to-alicloud-rds.md)
-    - [Connect to AWS Confluent Cloud](/tidb-cloud/serverless-private-link-connection-to-confluent.md)
+    - [Connect to AWS Confluent Cloud](/tidb-cloud/serverless-private-link-connection-to-aws-confluent.md)
     - [Connect to Self-Hosted Kafka in AWS](/tidb-cloud/serverless-private-link-connection-to-self-hosted-kafka-in-aws.md)
   - Audit Management
     - [Console Audit Logging](/tidb-cloud/tidb-cloud-console-auditing.md)

tidb-cloud/serverless-private-link-connection-to-alicloud-rds.md

@@ -25,7 +25,7 @@ The RDS must meet the following requirements:
 
 - The Alibaba Cloud region for your RDS instance must be the same as the region for your {{.essential}}.
 - The subnet group of your RDS must have overlapping availability zones as your {{.essential}}.
-- Make sure your RDS instance is accessible within the VPC.
+- Make sure your RDS instance set proper IP whitelist and is accessible within the VPC.
 
 > **Note**
 >

tidb-cloud/serverless-private-link-connection-to-aws-rds.md

@@ -26,6 +26,7 @@ The RDS must meet the following requirements:
 
 - The RDS must be in the same AWS region as your {{.essential}}.
 - The subnet group of your RDS must have overlapping availability zones as your {{.essential}}.
+- Make sure your RDS instance set proper security group and is accessible within the VPC.
 
 > **Note**
 >