Make StorageContainerSasToken parameter optional (Azure#19925)

* Make parameter optional and fix help file

* change log

* fix order of a help file

Co-authored-by: Milan Brkic <[email protected]>

Author: milanbrkic-ms

src/Sql/Sql/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* StorageContainerSasToken parameter in the `Start-AzSqlInstanceDatabaseLogReplay` cmdlet is now optional
 
 ## Version 4.0.0
 * Added new fields to the `Get-AzSqlInstanceDatabaseLogReplay` cmdlet

src/Sql/Sql/ManagedDatabase/Cmdlet/StartAzureSqlInstanceDatabaseLogReplay.cs

@@ -42,7 +42,7 @@ public class StartAzureSqlInstanceDatabaseLogReplay : AzureSqlManagedDatabaseLog
         /// <summary>
         /// Gets or sets the Sas token of the storage container.
         /// </summary>
-        [Parameter(Mandatory = true,
+        [Parameter(Mandatory = false,
             HelpMessage = "The storage container Sas token.")]
         [Alias("SasToken")]
         [ValidateNotNullOrEmpty]

src/Sql/Sql/help/Start-AzSqlInstanceDatabaseLogReplay.md

@@ -53,15 +53,22 @@ Start-AzSqlInstanceDatabaseLogReplay -ResourceGroupName "ResourceGroup01" -Insta
 This command will create new managed database and will start restoring backups from the given container until Complete-AzSqlInstanceDatabaseLogReplay is called with the last backup wanted.
 
 ### Example 3
+```powershell
+Start-AzSqlInstanceDatabaseLogReplay -ResourceGroupName "ResourceGroup01" -InstanceName "ManagedInstance01" -Name "ManagedDatabaseName" `
+	-StorageContainerIdentity ManagedIdentity -StorageContainerUri "https://test.blob.core.windows.net/testing"
+```
 
-Starts a Log Replay service with container identity specified.
+Starts a Log Replay service with container identity specified as ManagedIdentity. In this case there is no need to specify StorageContainerSasToken parameter.
 
+### Example 4
 ```powershell
 Start-AzSqlInstanceDatabaseLogReplay -ResourceGroupName "ResourceGroup01" -InstanceName "ManagedInstance01" -Name "ManagedDatabaseName" `
-	-StorageContainerIdentity ManagedIdentity -StorageContainerUri "https://test.blob.core.windows.net/testing" `
+	-StorageContainerIdentity SharedAccessSignature -StorageContainerUri "https://test.blob.core.windows.net/testing" `
 	-StorageContainerSasToken "sv=2019-02-02&ss=b&srt=sco&sp=rl&se=2023-12-02T00:09:14Z&st=2019-11-25T16:09:14Z&spr=https&sig=92kAe4QYmXaht%2Fgjocqwerqwer41s%3D"
 ```
 
+Starts a Log Replay service with container identity specified as SharedAccessSignature. StorageContainerSasToken parameter is required.
+
 ## PARAMETERS
 
 ### -AsJob