Adding missing brackets

armTemplates/dc-deploy.json

@@ -69,7 +69,7 @@
   "variables": {
     "vhdStorageAccountName": "[concat('vhds', uniqueString(resourceGroup().id))]",
     "storageAccountType": "Premium_LRS",
-    "dcVMName": "parameters('dcVmName')",
+    "dcVMName": "[parameters('dcVmName')]",
     "imagePublisher": "MicrosoftWindowsServer",
     "imageOffer": "WindowsServer",
     "imageSKU": "2016-Datacenter",