Remove unnecessary using and whitespace

Author: MaggieKimani1

src/Microsoft.OpenApi/Reader/OpenApiJsonReader.cs

@@ -20,7 +20,6 @@ namespace Microsoft.OpenApi.Reader
     /// </summary>
     public class OpenApiJsonReader : IOpenApiReader
     {
-
         /// <summary>
         /// Reads the memory stream input and parses it into an Open API document.
         /// </summary>

src/Microsoft.OpenApi/Reader/OpenApiModelFactory.cs

@@ -1,10 +1,11 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
 using System;
 using System.IO;
 using System.Linq;
 using System.Net.Http;
+using System.Runtime.InteropServices.ComTypes;
 using System.Security;
 using System.Text;
 using System.Threading;