Update configuration-infrastructure.md

Author: JackStromberg

articles/application-gateway/configuration-infrastructure.md

@@ -30,7 +30,7 @@ Consider a subnet that has 27 application gateway instances and an IP address fo
 
 Application Gateway (Standard or WAF) SKU can support up to 32 instances (32 instance IP addresses + 1 private frontend IP configuration + 5 Azure reserved) – so a minimum subnet size of /26 is recommended
 
-Application Gateway (Standard_v2 or WAF_v2 SKU) can support up to 125 instances (125 instance IP addresses + 1 private frontend IP configuration IP + 5 Azure reserved). A minimum subnet size of /24 is recommended.
+Application Gateway (Standard_v2 or WAF_v2 SKU) can support up to 125 instances (125 instance IP addresses + 1 private frontend IP configuration + 5 Azure reserved). A minimum subnet size of /24 is recommended.
 
 To determine the available capacity of a subnet that has existing Application Gateways provisioned, take the size of the subnet and subtract the five reserved IP addresses of the subnet reserved by the platform.  Next, take each gateway and subtract the the max-instance count.  For each gateway that has a private IP, subtract one additional IP address per gateway as well.