/usr/share/doc/libbonobo2-dev/bonobo-activation is in libbonobo2-dev 2.32.1-0ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libbonobo2-dev/../../gtk-doc/html/bonobo-activation
/usr/share/doc/libbonobo2-dev/../../gtk-doc/html/bonobo-activation