Update cluster-container-registry-integration.md

Author: dcbrown16

articles/aks/cluster-container-registry-integration.md

@@ -29,7 +29,7 @@ You can set up AKS and ACR integration during the initial creation of your AKS c
 
 ```azurecli
 # set this to the name of your Azure Container Registry.  It must be globally unique
-MYACR=myContainerRegistry
+$MYACR=myContainerRegistry
 
 # Run the following line to create an Azure Container Registry if you do not already have one
 az acr create -n $MYACR -g myContainerRegistryResourceGroup --sku basic