/usr/share/doc/debiandoc-sgml/debiandoc-sgml.en.txt.gz is in debiandoc-sgml-doc 1.1.22.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/debiandoc-sgml/../debiandoc-sgml-doc/debiandoc-sgml.en.txt.gz