variables for resource group name

Author: vhorne

articles/web-application-firewall/ag/quick-create-template.md

@@ -66,11 +66,12 @@ Use IIS to test the application gateway:
 4. Change the custom rule to **Allow traffic**.
   Run the following Azure PowerShell script, replacing your resource group name:
    ```azurepowershell
-   $AppGW = Get-AzApplicationGateway -Name myAppGateway -ResourceGroupName <your resource group name>
-   $pol = Get-AzApplicationGatewayFirewallPolicy -Name WafPol01 -ResourceGroupName <your resource group name>
+   $rg = <your resource group name>
+   $AppGW = Get-AzApplicationGateway -Name myAppGateway -ResourceGroupName $rg
+   $pol = Get-AzApplicationGatewayFirewallPolicy -Name WafPol01 -ResourceGroupName $rg
    $pol[0].customrules[0].action = "allow"
    $rule = $pol.CustomRules
-   Set-AzApplicationGatewayFirewallPolicy -Name WafPol01 -ResourceGroupName <your resource group name> -CustomRule $rule
+   Set-AzApplicationGatewayFirewallPolicy -Name WafPol01 -ResourceGroupName $rg -CustomRule $rule
    $AppGW.FirewallPolicy = $pol
    Set-AzApplicationGateway -ApplicationGateway $AppGW
    ```