Man pages matching name umount.davfs in section 8:

umount.davfs.8.de	debian 10 / davfs2
umount.davfs.8.en	debian 10 / davfs2
umount.davfs.8.de	debian 11 / davfs2
umount.davfs.8.en	debian 11 / davfs2
umount.davfs.8.de	debian 12 / davfs2
umount.davfs.8.en	debian 12 / davfs2