Docs imply unneccessary manual effort to set windows icons

[Draradech]

Your Godot version:
4.4-beta1

Issue description:
The docs imply that creating an ico file is neccessary to get custom icons on windows (both file and taskbar). Neither is the case, both of them will fall back to application/config/icon if nothing else is set.

The exporter gained ico creation support here: godotengine/godot#68828 and gained the fallback here: godotengine/godot#77821
Taskbar did always fall back to application/config/icon (since introduction of native icon)
Note: taskbar icon is currently bugged in 4.4-beta1 export because of uid introduction: godotengine/godot#101748

URL to the documentation page:
https://docs.godotengine.org/en/latest/tutorials/export/changing_application_icon_for_windows.html