Update xml/ns-System.Web.xml

Author: gewarren

xml/ns-System.Web.xml

@@ -1,6 +1,6 @@
 <Namespace Name="System.Web">
   <Docs>
-    <summary>This namespace contains the <see cref="T:System.Web.HttpUtility" /> class.</summary>
+    <summary>To be added.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>