Update add-artifact-vm.md

Updated the powershell cmd

Author: BharathNimmala-MSFT

articles/lab-services/add-artifact-vm.md

@@ -87,7 +87,7 @@ param
 Set-AzContext -SubscriptionId $SubscriptionId | Out-Null
  
 # Get the lab resource group name
-$resourceGroupName = (Find-AzResource -ResourceType 'Microsoft.DevTestLab/labs' | Where-Object { $_.Name -eq $DevTestLabName}).ResourceGroupName
+$resourceGroupName = (Get-AzResource -ResourceType 'Microsoft.DevTestLab/labs' | Where-Object { $_.Name -eq $DevTestLabName}).ResourceGroupName
 if ($resourceGroupName -eq $null) { throw "Unable to find lab $DevTestLabName in subscription $SubscriptionId." }
 
 # Get the internal repo name