/usr/share/doc/fcitx-table-erbi/changelog.Debian.gz is in fcitx-table-erbi 1:4.2.9.1-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/fcitx-table-erbi/../fcitx-modules/changelog.Debian.gz