cleaned-up dispose TODO (#22703)

src/common/interop/interop-tests/InteropTests.cs

@@ -66,8 +66,6 @@ namespace Microsoft.Interop.Tests
                     ClientPipe.Dispose();
                 }
 
-                // TODO: free unmanaged resources (unmanaged objects) and override finalizer
-                // TODO: set large fields to null
                 disposedValue = true;
             }
         }