/usr/share/gtk-doc/html/libgimpconfig/ is in libgimp2.0-doc 2.8.18-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/libgimpconfig/GimpColorConfig.html
/usr/share/gtk-doc/html/libgimpconfig/home.png
/usr/share/gtk-doc/html/libgimpconfig/index.html
/usr/share/gtk-doc/html/libgimpconfig/left-insensitive.png
/usr/share/gtk-doc/html/libgimpconfig/left.png
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-GimpConfig-deserialize.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-GimpConfig-params.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-GimpConfig-path.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-GimpConfig-serialize.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-GimpConfig-utils.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-GimpConfig.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-GimpConfigError.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-GimpConfigWriter.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-GimpScanner.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-hierarchy.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-index-deprecated.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-index-new-in-2-4.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-index-new-in-2-6.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-index-new-in-2-8.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig-index.html
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig.devhelp2
/usr/share/gtk-doc/html/libgimpconfig/libgimpconfig.html
/usr/share/gtk-doc/html/libgimpconfig/right-insensitive.png
/usr/share/gtk-doc/html/libgimpconfig/right.png
/usr/share/gtk-doc/html/libgimpconfig/style.css
/usr/share/gtk-doc/html/libgimpconfig/up-insensitive.png
/usr/share/gtk-doc/html/libgimpconfig/up.png