/usr/share/man/man5/update-exim4.conf.conf.5.gz is in exim4-config 4.89-2+deb9u3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man5/../man8/update-exim4.conf.8.gz
/usr/share/man/man5/../man8/update-exim4.conf.8.gz