/usr/share/texlive/texmf-dist/doc is in texlive-base 2017.20180305-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/texlive/texmf-dist/../../doc/texlive-doc
/usr/share/texlive/texmf-dist/../../doc/texlive-doc