Update ChangeLog.md

Author: dolauli

src/Sql/Sql/ChangeLog.md

@@ -18,10 +18,10 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Fixed `Set-AzSqlDatabaseFailoverGroup` when going from multi-secondary to single secondary
 
 ## Version 4.12.0
 * Added new parameters `MaintenanceConfigurationId`, `DnsZone` to `AzSqlInstancePool` cmdlets
-* Fixed `Set-AzSqlDatabaseFailoverGroup` when going from multi-secondary to single secondary
 
 ## Version 4.11.0
 * Added new parameters to `New-AzSqlDatabaseFailoverGroup`, `Set-AzSqlDatabaseFailoverGroup`