/usr/share/doc/gir1.2-gudev-1.0 is in gir1.2-gudev-1.0 215-17+deb8u7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgudev-1.0-0
/usr/share/doc/libgudev-1.0-0