Update migrate-stv1-to-stv2-no-vnet.md

Restored APIM_NAME variable in script

Author: dlepow

articles/api-management/migrate-stv1-to-stv2-no-vnet.md

@@ -76,6 +76,7 @@ Run the following Azure CLI commands, setting variables where indicated with the
 > The following script is written for the bash shell. To run the script in PowerShell, prefix the variable names with the `$` character. Example: `$APIM_NAME`.
 
 ```azurecli
+APIM_NAME={name of your API Management instance}
 RG_NAME={name of your resource group}
 # Get resource ID of API Management instance
 APIM_RESOURCE_ID=$(az apim show --name $APIM_NAME --resource-group $RG_NAME --query id --output tsv)
@@ -182,4 +183,4 @@ After successful migration to a new VIP address, update any network dependencies
 
    The user/process undertaking the migration needs [write access to the API Management instance](./api-management-role-based-access-control.md).
 
-[!INCLUDE [api-management-migration-related-content](../../includes/api-management-migration-related-content.md)]
+[!INCLUDE [api-management-migration-related-content](../../includes/api-management-migration-related-content.md)]