/usr/share/doc/libusbmuxd-tools/changelog.Debian.gz is in libusbmuxd-tools 1.1.0~git20171206.c724e70f-0.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libusbmuxd-tools/../libusbmuxd4/changelog.Debian.gz