Merge pull request #11198 from julieMSFT/whatsnewlinkupdate

updated reference-azdata link

Author: PRMerger9

docs/sql-server/what-s-new-in-sql-server-ver15-prerelease.md

@@ -26,7 +26,7 @@ For the current information, see [What's New in SQL Server 2019](what-s-new-in-s
 
 | New feature or update | Details |
 |:---|:---|
-| `mssqlctl` command changes | `mssqlctl cluster` commands have been renamed to `mssqlctl bdc`. For more information, see the [`mssqlctl` reference](../big-data-cluster/reference-mssqlctl.md). |
+| `mssqlctl` command changes | `mssqlctl cluster` commands have been renamed to `mssqlctl bdc`. For more information, see the [`mssqlctl` reference](../big-data-cluster/reference-azdata.md). |
 |New status commands for `mssqlsctl`|`mssqlctl` adds new commands to complement existing monitoring commands. These replace the cluster administration portal - which is removed in this release.|
 | Spark compute pools | Create additional nodes to increase Spark compute power without having to scale up storage. In addition, you can start storage pool nodes that aren't used for Spark. Spark and storage are decoupled. For more information, see [Configure storage without spark](../big-data-cluster/deployment-custom-configuration.md#sparkstorage). |
 | MSSQL Spark connector | Support for read/write to data pool external tables. Previous releases supported read/write to MASTER instance tables only. For more information, see [How to read and write to SQL Server from Spark using the MSSQL Spark Connector](../big-data-cluster/spark-mssql-connector.md). |
@@ -174,7 +174,7 @@ For the current information, see [What's New in SQL Server 2019](what-s-new-in-s
 | Submit Spark jobs on big data clusters in IntelliJ. | [Submit Spark jobs on SQL Server big data clusters in IntelliJ](../big-data-cluster/spark-submit-job-intellij-tool-plugin.md) |
 | Common CLI for application deployment and cluster management. | [How to deploy an app on SQL Server 2019 big data cluster (preview)](../big-data-cluster/big-data-cluster-create-apps.md) |
 | VS Code extension to deploy applications to a big data cluster. | [How to use VS Code to deploy applications to SQL Server big data clusters](../big-data-cluster/app-deployment-extension.md) |
-| Changes to the **mssqlctl** tool command usage. | For more details see the [known issues for mssqlctl](../big-data-cluster/release-notes-big-data-cluster.md#mssqlctlctp23). |
+| Changes to the **mssqlctl** tool command usage. | For more details see the [known issues for mssqlctl](../big-data-cluster/release-notes-big-data-cluster.md ). |
 | Use Sparklyr in big data cluster. | [Use Sparklyr in SQL Server 2019 big data cluster](../big-data-cluster/sparklyr-from-RStudio.md) |
 | Mount external HDFS-compatible storage into big data cluster with **HDFS tiering**. | See [HDFS tiering](../big-data-cluster/hdfs-tiering.md). |
 | New unified connection experience for the SQL Server master instance and the HDFS/Spark Gateway. | See [SQL Server master instance and the HDFS/Spark Gateway](../big-data-cluster/connect-to-big-data-cluster.md). |