Update system-tray.mdx

[timuric]

Note for those who are migrating from v1
tauri-apps/tauri#10912

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[tweidinger]

Imho I think this should be part of the migration guide in https://v2.tauri.app/start/migrate/from-tauri-1/#migrate-to-tray-icon-module as the plugin documentation itself is for v2. Wdyt @FabianLars ?

[FabianLars]

Yes, but even then the comment is a bit too extreme. It's not necessarily obsolte, it just works differently now.

[timuric]

@FabianLars My intention was to prevent people from creating two tray icons;

It's not necessarily obsolteIt's not necessarily obsolte

Perhaps the note could point to the configuration alternative and why it would be useful.