/usr/share/gtk-doc/ is in libgdk-pixbuf2.0-doc 2.36.5-2+deb9u2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/gdk-pixbuf/
/usr/share/gtk-doc/html/gdk-pixbuf/GdkPixbufLoader.html
/usr/share/gtk-doc/html/gdk-pixbuf/annotation-glossary.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-12.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-14.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-2.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-26.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-28.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-30.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-32.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-36.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-4.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-6.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-2-8.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-deprecated.html
/usr/share/gtk-doc/html/gdk-pixbuf/api-index-full.html
/usr/share/gtk-doc/html/gdk-pixbuf/composite.png
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-Animations.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-File-Loading.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-File-saving.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-Image-Data-in-Memory.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-Inline-data.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-Module-Interface.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-Reference-Counting-and-Memory-Mangement.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-Scaling.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-The-GdkPixbuf-Structure.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-Utilities.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-Versioning.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-X-Drawables-to-Pixbufs.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-Xlib-Rendering.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-XlibRGB.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-csource.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-gdk-pixbuf-Xlib-initialization.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-gdk-pixbuf-from-drawables.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-gdk-pixbuf-rendering.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-query-loaders.html
/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf.devhelp2
/usr/share/gtk-doc/html/gdk-pixbuf/home.png
/usr/share/gtk-doc/html/gdk-pixbuf/index.html
/usr/share/gtk-doc/html/gdk-pixbuf/left-insensitive.png
/usr/share/gtk-doc/html/gdk-pixbuf/left.png
/usr/share/gtk-doc/html/gdk-pixbuf/license.html
/usr/share/gtk-doc/html/gdk-pixbuf/right-insensitive.png
/usr/share/gtk-doc/html/gdk-pixbuf/right.png
/usr/share/gtk-doc/html/gdk-pixbuf/rn01.html
/usr/share/gtk-doc/html/gdk-pixbuf/rn02.html
/usr/share/gtk-doc/html/gdk-pixbuf/style.css
/usr/share/gtk-doc/html/gdk-pixbuf/up-insensitive.png
/usr/share/gtk-doc/html/gdk-pixbuf/up.png