update documentation.

src/Avalonia.Controls/TrayIcon.cs

@@ -5,7 +5,6 @@ using Avalonia.Collections;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Controls.Platform;
 using Avalonia.Platform;
-using Avalonia.Threading;
 
 #nullable enable
 
@@ -58,8 +57,8 @@ namespace Avalonia.Controls
 
         /// <summary>
         /// Raised when the TrayIcon is clicked.
-        /// Note, this is only supported on Win32.
+        /// Note, this is only supported on Win32 and some Linux DEs, 
-        /// Linux and OSX this event is not raised.
+        /// on OSX this event is not raised.
         /// </summary>
         public event EventHandler? Clicked;