Fixed param to AzPs call

Author: TomArcherMsft

articles/cognitive-services/create-account-terraform.md

@@ -111,7 +111,7 @@ In this article, you learn how to:
 
     ```azurepowershell
     Get-AzCognitiveServicesAccount -ResourceGroupName $resource_group_name `
-                                   -Name $api_management_service_name
+                                   -Name $azurerm_cognitive_account_name
     ```
 
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