/usr/share/doc/python-sphinxcontrib-httpdomain/changelog.Debian.gz is in python-sphinxcontrib-httpdomain 1.3.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python-sphinxcontrib-httpdomain/../python-sphinxcontrib.httpdomain/changelog.Debian.gz