/usr/share/doc/libdbusmenu-qt5-dev/changelog.Debian.gz is in libdbusmenu-qt5-dev 0.9.3+16.04.20160218-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdbusmenu-qt5-dev/../libdbusmenu-qt5-2/changelog.Debian.gz