fix

Author: CaptainFanZzz

src/Network/Network/help/New-AzApplicationGatewayHttpListener.md

@@ -126,7 +126,7 @@ Specifies the ID of an existing top-level web application firewall resource.
 Firewall policy IDs can be returned by using the Get-AzApplicationGatewayWebApplicationFirewallPolicy cmdlet. 
 After we have the ID you can use *FirewallPolicyId* parameter instead of *FirewallPolicy* parameter.
 For instance:
--FirewallPolicyId  �/subscriptions/<subscription-id>/resourceGroups/<resource-group-id>/providers/Microsoft.Network/ApplicationGatewayWebApplicationFirewallPolicies/<firewallPolicyName>�
+-FirewallPolicyId  �/subscriptions/<subscription-id>/resourceGroups/<resource-group-id>/providers/Microsoft.Network/ApplicationGatewayWebApplicationFirewallPolicies/<firewallPolicyName>�
 
 ```yaml
 Type: System.String