Merge pull request #33379 from NathanMSFT/DWDatabasesinAG

PolyBase DW databases cannot be added into an Availability Group

Author: prmerger-automator[bot]

docs/relational-databases/polybase/polybase-versioned-feature-summary.md

@@ -63,9 +63,11 @@ PolyBase has the following limitations:
 
 - Hadoop is no longer supported in [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)] and later versions.
 
+- Server name length is bound by 15-character NetBIOS name length limitation. If you change the server name after creating it to be 16 characters or longer, PolyBase Data Movement service won't start.
+
 - PolyBase scale-out groups are not supported with Always On availability groups.
 
-- Server name length is bound by 15-character NetBIOS name length limitation. If you change the server name after creating it to be 16 characters or longer, PolyBase Data Movement service won't start.
+- Databases that get installed with PolyBase (DWConfiguration, DWDiagnostics, DWQueue) must be in read-write mode in order for PolyBase to function and for Cumulative Update installations to succeed. Therefore, it is not supported to have these databases in an availability group.
 
 <!--SQL Server 2016-->
 ::: moniker range="= sql-server-2016 "