/usr/share/doc/libwxgtk-media3.0-dev/changelog.Debian.gz is in libwxgtk-media3.0-dev 3.0.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libwxgtk-media3.0-dev/../wx-common/changelog.Debian.gz