Update Set-AzSqlDatabaseVulnerabilityAssessmentRuleBaseline.md (#14432)

The default powershell array does not parse the values correctly when there is a single array , However it works fine when there are multiple arrays. 
The workaround would be to not use the default array and use [System.Collections.ArrayList] as mentioned in here #12092.
Please update the documentation , we have customers wondering why this command is not working on single array. 
I have added the script above as well in Example 1.

src/Sql/Sql/help/Set-AzSqlDatabaseVulnerabilityAssessmentRuleBaseline.md

@@ -28,7 +28,22 @@ Note that you need to run *Enable-AzSqlServerAdvancedDataSecurity* and *Update-A
 
 ### Example 1: Set a vulnerability assessment rule baseline
 ```powershell
-PS C:\> Set-AzSqlDatabaseVulnerabilityAssessmentRuleBaseline  `
+PS C:\>  $arrayList = [System.Collections.ArrayList]::new()
+$arrayList.Add(@('dbo', 'db_owner', 'SQL_USER', 'INSTANCE'))
+
+Set-AzSqlDatabaseVulnerabilityAssessmentRuleBaseline `
+             -ResourceGroupName "demoresourcegroup" `
+            -ServerName "demosqlser" `
+            -DatabaseName "SQL_ERConnect" `
+            -BaselineResult $arrayList `
+            -RuleID 'VA2108'
+
+
+Rule ID Rule Applies To Master Baseline Results                
+------- ---------------------- ----------------                
+VA2108  False                  {dbo;db_owner;SQL_USER;INSTANCE}
+
+Set-AzSqlDatabaseVulnerabilityAssessmentRuleBaseline  `
 			-ResourceGroupName "ResourceGroup01" `
 			-ServerName "Server01"  `
 			-DatabaseName "Database01"  `