Fix style rules

Author: maraf

src/Components/Endpoints/src/Rendering/EndpointHtmlRenderer.Streaming.cs

@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Diagnostics;
-using System.Linq;
-using System.Reflection.PortableExecutable;
 using System.Runtime.InteropServices;
 using System.Text;
 using System.Text.Encodings.Web;