System.Web: Demote .NET Framework (dotnet#7457)

Author: yecril71pl

xml/ns-System.Web.xml

@@ -1,6 +1,10 @@
 <Namespace Name="System.Web">
-  <Docs><summary>Contains classes and interfaces that enable browser-server communication. This namespace
-    includes the <see cref="T:System.Web.HttpRequest" /> class, which provides extensive information about the current HTTP request; the <see cref="T:System.Web.HttpResponse" /> class, which manages HTTP output to the client; and the <see cref="T:System.Web.HttpServerUtility" /> class, which provides access to server-side utilities and processes. <see cref="N:System.Web" /> also includes classes for cookie manipulation, file transfer, exception information, and output cache control.</summary>
+  <Docs>
+    <summary>For <see href="/dotnet/api/system.web?view=net-6.0">.NET Core and .NET 5+</see>, this namespace contains the <see cref="T:System.Web.HttpUtility" /> class.
+    
+For <see href="/dotnet/api/system.web?view=netframework-4.8">.NET Framework</see>, this namespace contains classes and interfaces that enable browser-server communication. These classes include the <see cref="T:System.Web.HttpRequest" /> class, which provides extensive information about the current HTTP request; the <see cref="T:System.Web.HttpResponse" /> class, which manages HTTP output to the client;
+and the <see cref="T:System.Web.HttpServerUtility" /> class, which provides access to server-side utilities and processes. <see cref="N:System.Web" /> also includes classes for cookie manipulation, file transfer, exception information, and output cache control in .NET Framework.
+    </summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>