/usr/share/gtk-doc/html/ is in libspice-client-glib-2.0-dev 0.33-3.3+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/spice-gtk/
/usr/share/gtk-doc/html/spice-gtk/SpiceAudio.html
/usr/share/gtk-doc/html/spice-gtk/SpiceChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpiceCursorChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpiceDisplayChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpiceFileTransferTask.html
/usr/share/gtk-doc/html/spice-gtk/SpiceInputsChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpiceMainChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpicePlaybackChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpicePortChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpiceRecordChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpiceSession.html
/usr/share/gtk-doc/html/spice-gtk/SpiceSmartcardChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpiceSmartcardManager.html
/usr/share/gtk-doc/html/spice-gtk/SpiceUsbDeviceManager.html
/usr/share/gtk-doc/html/spice-gtk/SpiceUsbredirChannel.html
/usr/share/gtk-doc/html/spice-gtk/SpiceWebdavChannel.html
/usr/share/gtk-doc/html/spice-gtk/annotation-glossary.html
/usr/share/gtk-doc/html/spice-gtk/api-index-deprecated.html
/usr/share/gtk-doc/html/spice-gtk/api-index-full.html
/usr/share/gtk-doc/html/spice-gtk/api-reference.html
/usr/share/gtk-doc/html/spice-gtk/application-support.html
/usr/share/gtk-doc/html/spice-gtk/ch01.html
/usr/share/gtk-doc/html/spice-gtk/ch02.html
/usr/share/gtk-doc/html/spice-gtk/ch03.html
/usr/share/gtk-doc/html/spice-gtk/home.png
/usr/share/gtk-doc/html/spice-gtk/index.html
/usr/share/gtk-doc/html/spice-gtk/left-insensitive.png
/usr/share/gtk-doc/html/spice-gtk/left.png
/usr/share/gtk-doc/html/spice-gtk/object-tree.html
/usr/share/gtk-doc/html/spice-gtk/right-insensitive.png
/usr/share/gtk-doc/html/spice-gtk/right.png
/usr/share/gtk-doc/html/spice-gtk/spice-gtk-SpiceDisplay.html
/usr/share/gtk-doc/html/spice-gtk/spice-gtk-SpiceGtkSession.html
/usr/share/gtk-doc/html/spice-gtk/spice-gtk-SpiceURI.html
/usr/share/gtk-doc/html/spice-gtk/spice-gtk-SpiceUsbDeviceWidget.html
/usr/share/gtk-doc/html/spice-gtk/spice-gtk-Utilities.html
/usr/share/gtk-doc/html/spice-gtk/spice-gtk-Version-Information.html
/usr/share/gtk-doc/html/spice-gtk/spice-gtk.devhelp2
/usr/share/gtk-doc/html/spice-gtk/style.css
/usr/share/gtk-doc/html/spice-gtk/up-insensitive.png
/usr/share/gtk-doc/html/spice-gtk/up.png