/usr/share/doc/python-pygments/rst is in python-pygments-doc 2.2.0+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python-pygments/../python-pygments-doc/html/_sources
/usr/share/doc/python-pygments/../python-pygments-doc/html/_sources