cloud: add singapore region (pingcap#11416)

tidb-cloud/migrate-from-mysql-using-data-migration.md

@@ -13,7 +13,7 @@ This feature helps you migrate your database and its ongoing changes to TiDB Clo
 
 - The Data Migration feature is available only for **Dedicated Tier** clusters.
 
-- The Data Migration feature is only available to clusters created in the AWS `Oregon (us-west-2)` region after November 9, 2022. If your cluster was created before the date or if your cluster is in another region, this feature is not available to your cluster and the **Data Migration** tab will not be displayed on the cluster overview page in the TiDB Cloud console.
+- The Data Migration feature is only available to clusters created in the AWS Oregon (us-west-2) and AWS Singapore (ap-southeast-1) regions after November 9, 2022. If your cluster was created before the date or if your cluster is in another region, this feature is not available to your cluster and the **Data Migration** tab will not be displayed on the cluster overview page in the TiDB Cloud console.
 
 - Currently, the Data Migration feature is in beta, and you can create only one migration job **for free** for each organization. To create more migration jobs, you need to [file a support ticket](/tidb-cloud/tidb-cloud-support.md).
 

tidb-cloud/release-notes-2022.md

@@ -18,7 +18,7 @@ This page lists the release notes of [TiDB Cloud](https://www.pingcap.com/tidb-c
 
     In addition, Data Migration provides full and incremental data migration capabilities to migrate both existing data and ongoing changes from your data source to TiDB Cloud.
 
-    Currently, the Data Migration feature is still **in beta**. It is available only for [Dedicated Tier](/tidb-cloud/select-cluster-tier.md#dedicated-tier) clusters and only in the AWS Oregon (us-west-2) region. You can create one migration job for free for each organization. To create multiple migration jobs for an organization, you need to [file a ticket](/tidb-cloud/tidb-cloud-support.md).
+    Currently, the Data Migration feature is still **in beta**. It is available only for [Dedicated Tier](/tidb-cloud/select-cluster-tier.md#dedicated-tier) clusters and only in the AWS Oregon (us-west-2) and AWS Singapore (ap-southeast-1) regions. You can create one migration job for free for each organization. To create multiple migration jobs for an organization, you need to [file a ticket](/tidb-cloud/tidb-cloud-support.md).
 
     For detailed information, see [Migrate MySQL-Compatible Databases to TiDB Cloud Using Data Migration](/tidb-cloud/migrate-from-mysql-using-data-migration.md).