Update site limit

Author: vhorne

articles/application-gateway/overview.md

@@ -6,7 +6,7 @@ author: vhorne
 ms.service: application-gateway
 ms.topic: overview
 ms.custom: mvc
-ms.date: 10/11/2018
+ms.date: 1/11/2019
 ms.author: victorh
 #Customer intent: As an IT administrator, I want to learn about Azure Application Gateways and what I can use them for.
 ---
@@ -77,7 +77,7 @@ For example, requests for `http://contoso.com/video/*` are routed to VideoServer
 
 ## Multiple-site hosting
 
-Multiple-site hosting enables you to configure more than one web site on the same application gateway instance. This feature allows you to configure a more efficient topology for your deployments by adding up to 20 web sites to one application gateway. Each web site can be directed to its own pool. For example, application gateway can serve traffic for `contoso.com` and `fabrikam.com` from two server pools called ContosoServerPool and FabrikamServerPool.
+Multiple-site hosting enables you to configure more than one web site on the same application gateway instance. This feature allows you to configure a more efficient topology for your deployments by adding up to 100 web sites to one application gateway. Each web site can be directed to its own pool. For example, application gateway can serve traffic for `contoso.com` and `fabrikam.com` from two server pools called ContosoServerPool and FabrikamServerPool.
 
 Requests for `http://contoso.com` are routed to ContosoServerPool, and `http://fabrikam.com` are routed to FabrikamServerPool.