Removed leftover comment

Microsoft.Toolkit.Mvvm/ComponentModel/ObservableRecipient.cs

@@ -7,13 +7,6 @@
 // This file is inspired from the MvvmLight library (lbugnion/MvvmLight),
 // more info in ThirdPartyNotices.txt in the root of the project.
 
-// ================================= NOTE =================================
-// This file is mirrored in the ObservableRecipient annotated copy
-// (for debugging info) in the Mvvm.SourceGenerators project.
-// If any changes are made to this file, they should also be appropriately
-// ported to that file as well to keep the behavior consistent.
-// ========================================================================
-
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;