/usr/share/doc/antlr3.2-gunit-maven-plugin/changelog.Debian.gz is in antlr3.2-gunit-maven-plugin 3.2-14.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/antlr3.2-gunit-maven-plugin/../antlr3.2/changelog.Debian.gz