docs: note that there are non tray icon events on linux (#3492)

Author: ariyadey

src/content/docs/learn/system-tray.mdx

@@ -230,6 +230,10 @@ The tray icon emits events for the following mouse events:
 - Move: triggered when the cursor moves around the tray icon area
 - Leave: triggered when the cursor leaves the tray icon area
 
+:::note
+Linux: Unsupported. The event is not emitted even though the icon is shown and will still show a context menu on right click.
+:::
+
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