AI seeded comments from robch and then edited by stephentoub (#238)

* AI generated `///` comment updates

* Fix compilation issues

* Fix incorrect XML comment structure

* Update all Client comments

* Update all Configuration comments

* Update all Messages comments

* Update all Transport comments

* Update all Types comments

* Update all Server comments

* Undo some commenting

---------

Co-authored-by: Stephen Toub <stoub@microsoft.com>

src/ModelContextProtocol/Protocol/Types/PingResult.cs

@@ -1,9 +1,19 @@
-namespace ModelContextProtocol.Protocol.Types;
+using ModelContextProtocol.Protocol.Messages;
+
+namespace ModelContextProtocol.Protocol.Types;
 
 /// <summary>
-/// Dummy result for the ping request.
-/// <see href="https://github.com/modelcontextprotocol/specification/blob/main/schema/">See the schema for details</see>
+/// Represents the result of a <see cref="RequestMethods.Ping"/> request in the Model Context Protocol.
 /// </summary>
-public record PingResult
-{
-}
+/// <remarks>
+/// <para>
+/// The <see cref="PingResult"/> is returned in response to a <see cref="RequestMethods.Ping"/> request, 
+/// which is used to verify that the connection between client and server is still alive and responsive. 
+/// Since this is a simple connectivity check, the result is an empty object containing no data.
+/// </para>
+/// <para>
+/// Ping requests can be initiated by either the client or the server to check if the other party
+/// is still responsive.
+/// </para>
+/// </remarks>
+public record PingResult;