remote-desktop-page: Add link to instruct how to use remote desktop
As shown in the following mockups: https://gitlab.gnome.org/Teams/Design/settings-mockups/-/blob/master/remote-desktop/remote-desktop.png
Edited by Automeris naranja
As shown in the following mockups: https://gitlab.gnome.org/Teams/Design/settings-mockups/-/blob/master/remote-desktop/remote-desktop.png