/usr/share/gtk-doc/html/ is in libunicapgtk-docs 0.9.5-1.1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/libunicapgtk/
/usr/share/gtk-doc/html/libunicapgtk/UnicapgtkDeviceProperty.html.upstream
/usr/share/gtk-doc/html/libunicapgtk/UnicapgtkDeviceSelection.html.upstream
/usr/share/gtk-doc/html/libunicapgtk/UnicapgtkPropertyDialog.html.upstream
/usr/share/gtk-doc/html/libunicapgtk/ch01.html.upstream
/usr/share/gtk-doc/html/libunicapgtk/home.png
/usr/share/gtk-doc/html/libunicapgtk/index.html
/usr/share/gtk-doc/html/libunicapgtk/index.sgml
/usr/share/gtk-doc/html/libunicapgtk/left.png
/usr/share/gtk-doc/html/libunicapgtk/libunicapgtk-unicapgtk-version.html
/usr/share/gtk-doc/html/libunicapgtk/libunicapgtk-unicapgtk-video-display.html
/usr/share/gtk-doc/html/libunicapgtk/libunicapgtk-unicapgtk-video-format-selection.html
/usr/share/gtk-doc/html/libunicapgtk/libunicapgtk-unicapgtk.html
/usr/share/gtk-doc/html/libunicapgtk/libunicapgtk.devhelp
/usr/share/gtk-doc/html/libunicapgtk/libunicapgtk.devhelp2
/usr/share/gtk-doc/html/libunicapgtk/right.png
/usr/share/gtk-doc/html/libunicapgtk/style.css
/usr/share/gtk-doc/html/libunicapgtk/up.png