Apply suggestions from code review

Co-authored-by: richardmorton-msft <[email protected]>

Author: nslack

articles/communications-gateway/plan-and-manage-costs.md

@@ -69,7 +69,7 @@ If your Azure subscription has a spending limit, Azure prevents you from spendin
 
 You must pay for Azure networking costs, because these costs aren't included in the Azure Communications Gateway meters.
 
-- If you're connecting to the public internet with Microsoft Azure Peering Service for Voice (MAPS Voice), bandwidth costs are included in Azure Communications Gateway but you might need to pay a third party for the cross-connect at the exchange location.
+- If you're connecting to the public internet with Microsoft Azure Peering Service for Voice (MAPS Voice), bandwidth costs are included in Azure Communications Gateway but you might need to pay a third party for the cross-connects at the exchange location.
 - If you're connecting to Azure with ExpressRoute, you must purchase ExpressRoute circuits with a specified bandwidth and data billing model.
 - If you're connecting into Azure as a next hop, you might need to pay virtual network peering costs.
 

articles/communications-gateway/prepare-for-vnet-injection.md

@@ -18,7 +18,7 @@ The following diagram shows an overview of Azure Communications Gateway deployed
 
 ## Prerequisites
 - Your Azure subscription is [enabled for Azure Communications Gateway](prepare-to-deploy.md#get-access-to-azure-communications-gateway-for-your-azure-subscription).
-- Your onboarding team is aware that you intend to use your own virtual network.
+- Your onboarding team is aware that you intend to use your own virtual networks.
 - You  have an Azure virtual network and subnet in each of the Azure regions to be used as the Azure Communications Gateway [service regions](reliability-communications-gateway.md#service-regions). Learn how to create a [virtual network](/azure/virtual-network/manage-virtual-network) and [subnet](/azure/virtual-network/virtual-network-manage-subnet).
 - Each subnet has at least 16 free IP addresses which can be used by Azure Communications Gateway. 
 - Your chosen connectivity solution (for example ExpressRoute) is deployed into your Azure subscription and ready to use.
@@ -76,7 +76,7 @@ The network security group configuration consists of two steps, to be carried ou
 
 Work with your onboarding team to determine the right network security group configuration for your virtual networks. This configuration depends on your connectivity choice (for example ExpressRoute) and your virtual network topology.
 
-Your network security group configuration should allow traffic to the necessary [Port ranges used by Azure Communications Gateway](./connectivity.md#port-ranges-used-by-azure-communications-gateway).
+Your network security group configuration must allow traffic to the necessary [Port ranges used by Azure Communications Gateway](./connectivity.md#port-ranges-used-by-azure-communications-gateway).
 
 ### Associate the subnet with the network security group