/usr/share/doc/lighttpd-mod-webdav/changelog.Debian.gz is in lighttpd-mod-webdav 1.4.33-1+nmu2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/lighttpd-mod-webdav/../lighttpd/changelog.Debian.gz