Apply suggestions from code review

Author: stephentoub

src/ModelContextProtocol/Protocol/Types/RequestParams.cs

@@ -1,6 +1,3 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
 using System.Text.Json.Serialization;
 
 namespace ModelContextProtocol.Protocol.Types;

src/ModelContextProtocol/Protocol/Types/RequestParamsMetadata.cs

@@ -1,6 +1,3 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
 using System.Text.Json.Serialization;
 
 namespace ModelContextProtocol.Protocol.Types;