Update container-instances-vnet.md

adding subnet delegation

Author: tysonfms

articles/container-instances/container-instances-vnet.md

@@ -17,10 +17,9 @@ ms.custom: devx-track-azurecli
 This article shows how to use the [az container create][az-container-create] command in the Azure CLI to deploy container groups to either a new virtual network or an existing virtual network.
 
 > [!IMPORTANT]
-> Before deploying container groups in virtual networks, we suggest checking the limitation first. For networking scenarios and limitations, see [Virtual network scenarios and resources for Azure Container Instances](container-instances-virtual-network-concepts.md).
-
-> [!IMPORTANT]
-> Container group deployment to a virtual network is generally available for Linux and Windows containers, in most regions where Azure Container Instances is available. For details, see [available-regions][available-regions].
+> * Subnets must be delegated before using a virtual network
+> * Before deploying container groups in virtual networks, we suggest checking the limitation first. For networking scenarios and limitations, see [Virtual network scenarios and resources for Azure Container Instances](container-instances-virtual-network-concepts.md).
+> * Container group deployment to a virtual network is generally available for Linux and Windows containers, in most regions where Azure Container Instances is available. For details, see [available-regions][available-regions].
 
 [!INCLUDE [network profile callout](./includes/network-profile/network-profile-callout.md)]