Man pages matching name lightdm-gtk-greeter-settings in section 8:

lightdm-gtk-greeter-settings.8.en	debian 10 / lightdm-gtk-greeter-settings
lightdm-gtk-greeter-settings.8.en	debian 11 / lightdm-gtk-greeter-settings
lightdm-gtk-greeter-settings.8.en	debian 12 / lightdm-gtk-greeter-settings