/usr/share/doc/libavahi-glib-dev/README is in libavahi-glib-dev 0.7-3.1ubuntu1.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libavahi-glib-dev/../libavahi-common-data/README
/usr/share/doc/libavahi-glib-dev/../libavahi-common-data/README