/usr/share/doc/python-musicbrainzngs-doc/rst is in python-musicbrainzngs-doc 0.6-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python-musicbrainzngs-doc/html/_sources
/usr/share/doc/python-musicbrainzngs-doc/html/_sources