Updated verbiage of Secure by default messaging

Updated verbiage of Secure by default messaging by adding a link for applying a Network Security Group

Author: magilbe

articles/virtual-network/ip-services/public-ip-upgrade.md

@@ -21,7 +21,7 @@ Azure public IP addresses are created with a SKU, either Basic or Standard. The
 In this article, you learn how to upgrade a static Basic SKU public IP address to Standard SKU in the Azure portal, Azure CLI, or Azure PowerShell.
 
 > [!IMPORTANT]
-> Be aware that Standard SKU IP Addresses are considered Secure by default and will be closed to all internal traffic. It is recommended to apply an NSG to the Subnet or Network Interface that the Public IP address is assoicated in order to prevent unexpected downtime, see [Public IP addresses in Azure](./public-ip-addresses.md#sku)
+> Standard SKU IP Addresses are deployed using the [**Secure by default**](public-ip-addresses.md#sku) model. By default, IP addresses will be closed to all internal traffic when used as a front-end. To allow traffic and prevent unexpected downtime, apply a [network security group (NSG)](../../virtual-network/network-security-groups-overview.md#network-security-groups) to public IP address' associated Network Interface (NIC) or subnet.
 
 ## Prerequisites