/usr/share/doc/libqt5webengine5/changelog.Debian.gz is in libqt5webengine5 5.9.5+dfsg-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libqt5webengine5/../libqt5webenginecore5/changelog.Debian.gz