Fix punctuation in firewall FAQ instructions

Author: ZarrVenkat

articles/firewall/firewall-faq.yml

@@ -157,7 +157,7 @@ sections:
            - All attached public IP addresses are deployed with availability zones. In the properties page of each public IP address, ensure the **availability zones** field exists and is configured with the same zones you configured for the firewall.
 
            Reconfiguring availability zones can only be done when you restart the firewall. First you need to deallocate the firewall (by using '$azfw.Deallocate()'), then change the zone configuration and then allocate the firewall (by using  '$azfw.Allocate()'). 
-          After you allocate the firewall, and right before starting the firewall with `Set-AzFirewall`, use the following Azure PowerShell to modify the firewall's **Zones** property:
+          After you allocate the firewall, and right before starting the firewall with `Set-AzFirewall`, use the following Azure PowerShell to modify the firewall's **Zones** property.
 
            ```azurepowershell
            $azfw = Get-AzFirewall -Name "FW Name" -ResourceGroupName "RG Name"