/usr/share/gtk-doc/html/gtk3

This file is indexed.

/usr/share/gtk-doc/html/gtk3 is in libgtk-3-doc 3.4.2-0ubuntu0.9.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/share/gtk-doc/html/../../doc/libgtk-3-doc/gtk3