[HTTP/2] MultipleConnections update (dotnet#9921)

dotnet/runtime#101531 (comment)

Author: ManickaP

xml/System.Net.Http/SocketsHttpHandler.xml

@@ -429,10 +429,10 @@ The default proxy is used only when <xref:System.Net.Http.SocketsHttpHandler.Use
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Gets or sets a value that indicates whether additional HTTP/2 connections can be established to the same server when the maximum number of concurrent streams is reached on all existing connections.</summary>
+        <summary>Gets or sets a value that indicates whether additional HTTP/2 connections can be established to the same server. </summary>
         <value>
           <see langword="true" /> if additional HTTP/2 connections are allowed to be created; otherwise, <see langword="false" />.</value>
-        <remarks>To be added.</remarks>
+        <remarks>Enabling multiple connections to the same server explicitly goes against <see href="https://www.rfc-editor.org/rfc/rfc9113.html#section-9.1-2">RFC 9113 - HTTP/2</see>.</remarks>
       </Docs>
     </Member>
     <Member MemberName="Expect100ContinueTimeout">