Add missing exception documentation to public API surface (#1103)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>

src/ModelContextProtocol.Core/Client/McpClientResourceTemplate.cs

@@ -80,6 +80,7 @@ public sealed class McpClientResourceTemplate
     /// </param>
     /// <param name="cancellationToken">The <see cref="CancellationToken"/> to monitor for cancellation requests. The default is <see cref="CancellationToken.None"/>.</param>
     /// <returns>A <see cref="ValueTask{ReadResourceResult}"/> containing the resource template's result with content and messages.</returns>
+    /// <exception cref="McpException">The request failed or the server returned an error response.</exception>
     public ValueTask<ReadResourceResult> ReadAsync(
         IReadOnlyDictionary<string, object?> arguments,
         CancellationToken cancellationToken = default) =>