Update tutorial-firewall-deploy-portal-policy.md

We are creating two subnets not three. Previous paragraph also mention 1 vnet with 2 subnets

Author: cjnova

articles/firewall/tutorial-firewall-deploy-portal-policy.md

@@ -66,7 +66,7 @@ The resource group contains all the resources for the tutorial.
 
 ### Create a VNet
 
-This VNet will have three subnets.
+This VNet will have two subnets.
 
 > [!NOTE]
 > The size of the AzureFirewallSubnet subnet is /26. For more information about the subnet size, see [Azure Firewall FAQ](firewall-faq.yml#why-does-azure-firewall-need-a--26-subnet-size).
@@ -277,4 +277,4 @@ You can keep your firewall resources for the next tutorial, or if no longer need
 ## Next steps
 
 > [!div class="nextstepaction"]
-> [Deploy and configure Azure Firewall Premium](premium-deploy.md)
+> [Deploy and configure Azure Firewall Premium](premium-deploy.md)