/usr/share/doc/gstreamer1.0-alsa/changelog.Debian.gz is in gstreamer1.0-alsa 1.2.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gstreamer1.0-alsa/../libgstreamer-plugins-base1.0-0/changelog.Debian.gz