Man pages matching name xfce4-notifyd-config in section 1:

xfce4-notifyd-config.1.en	debian 10 / xfce4-notifyd
xfce4-notifyd-config.1.en	debian 11 / xfce4-notifyd
xfce4-notifyd-config.1.en	debian 12 / xfce4-notifyd