Commit suggestions from PR review

Co-authored-by: Safia Abdalla <[email protected]>

Author: mikekistler

src/OpenApi/src/Extensions/OpenApiServiceCollectionExtensions.cs

@@ -1,7 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using Microsoft.AspNetCore;
+using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http.Json;
 using Microsoft.AspNetCore.OpenApi;
 using Microsoft.Extensions.ApiDescriptions;