/usr/share/gtk-doc/ is in libnm-glib-dev 1.10.6-2ubuntu1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/libnm-glib/
/usr/share/gtk-doc/html/libnm-glib/NMAccessPoint.html
/usr/share/gtk-doc/html/libnm-glib/NMActiveConnection.html
/usr/share/gtk-doc/html/libnm-glib/NMClient.html
/usr/share/gtk-doc/html/libnm-glib/NMDHCP4Config.html
/usr/share/gtk-doc/html/libnm-glib/NMDHCP6Config.html
/usr/share/gtk-doc/html/libnm-glib/NMDevice.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceAdsl.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceBond.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceBridge.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceBt.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceEthernet.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceGeneric.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceInfiniband.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceModem.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceOlpcMesh.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceTeam.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceVlan.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceWifi.html
/usr/share/gtk-doc/html/libnm-glib/NMDeviceWimax.html
/usr/share/gtk-doc/html/libnm-glib/NMIP4Config.html
/usr/share/gtk-doc/html/libnm-glib/NMIP6Config.html
/usr/share/gtk-doc/html/libnm-glib/NMObject.html
/usr/share/gtk-doc/html/libnm-glib/NMRemoteConnection.html
/usr/share/gtk-doc/html/libnm-glib/NMRemoteSettings.html
/usr/share/gtk-doc/html/libnm-glib/NMSecretAgent.html
/usr/share/gtk-doc/html/libnm-glib/NMVPNConnection.html
/usr/share/gtk-doc/html/libnm-glib/NMWimaxNsp.html
/usr/share/gtk-doc/html/libnm-glib/annotation-glossary.html
/usr/share/gtk-doc/html/libnm-glib/api-index-full.html
/usr/share/gtk-doc/html/libnm-glib/ch02.html
/usr/share/gtk-doc/html/libnm-glib/home.png
/usr/share/gtk-doc/html/libnm-glib/index.html
/usr/share/gtk-doc/html/libnm-glib/left-insensitive.png
/usr/share/gtk-doc/html/libnm-glib/left.png
/usr/share/gtk-doc/html/libnm-glib/libnm-glib-NMVPNPlugin.html
/usr/share/gtk-doc/html/libnm-glib/libnm-glib-NMVpnPluginUiWidget.html
/usr/share/gtk-doc/html/libnm-glib/libnm-glib-nm-types.html
/usr/share/gtk-doc/html/libnm-glib/libnm-glib-nm-vpn-plugin-utils.html
/usr/share/gtk-doc/html/libnm-glib/libnm-glib.devhelp2
/usr/share/gtk-doc/html/libnm-glib/libnm-glib.png
/usr/share/gtk-doc/html/libnm-glib/object-tree.html
/usr/share/gtk-doc/html/libnm-glib/ref-overview.html
/usr/share/gtk-doc/html/libnm-glib/right-insensitive.png
/usr/share/gtk-doc/html/libnm-glib/right.png
/usr/share/gtk-doc/html/libnm-glib/style.css
/usr/share/gtk-doc/html/libnm-glib/up-insensitive.png
/usr/share/gtk-doc/html/libnm-glib/up.png