/usr/share/gtk-doc/html/ is in network-manager-dev 1.6.2-3+deb9u2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/NetworkManager/
/usr/share/gtk-doc/html/NetworkManager/NetworkManager.conf.html
/usr/share/gtk-doc/html/NetworkManager/NetworkManager.devhelp2
/usr/share/gtk-doc/html/NetworkManager/NetworkManager.html
/usr/share/gtk-doc/html/NetworkManager/dbus-types.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.AccessPoint.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.AgentManager.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Connection.Active.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.DHCP4Config.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.DHCP6Config.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Adsl.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Bluetooth.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Bond.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Bridge.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Generic.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.IPTunnel.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Infiniband.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Macsec.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Macvlan.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Modem.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.OlpcMesh.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Statistics.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Team.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Tun.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Veth.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Vlan.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Vxlan.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.WiMax.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Wired.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.Wireless.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Device.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.DnsManager.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.IP4Config.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.IP6Config.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.PPP.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.SecretAgent.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Settings.Connection.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.Settings.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.VPN.Connection.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.VPN.Plugin.html
/usr/share/gtk-doc/html/NetworkManager/gdbus-org.freedesktop.NetworkManager.html
/usr/share/gtk-doc/html/NetworkManager/home.png
/usr/share/gtk-doc/html/NetworkManager/index.html
/usr/share/gtk-doc/html/NetworkManager/ix01.html
/usr/share/gtk-doc/html/NetworkManager/left-insensitive.png
/usr/share/gtk-doc/html/NetworkManager/left.png
/usr/share/gtk-doc/html/NetworkManager/license.html
/usr/share/gtk-doc/html/NetworkManager/manpages.html
/usr/share/gtk-doc/html/NetworkManager/nm-dbus-types.html
/usr/share/gtk-doc/html/NetworkManager/nm-online.html
/usr/share/gtk-doc/html/NetworkManager/nm-settings-ifcfg-rh.html
/usr/share/gtk-doc/html/NetworkManager/nm-settings-keyfile.html
/usr/share/gtk-doc/html/NetworkManager/nm-settings.html
/usr/share/gtk-doc/html/NetworkManager/nm-vpn-dbus-types.html
/usr/share/gtk-doc/html/NetworkManager/nmcli-examples.html
/usr/share/gtk-doc/html/NetworkManager/nmcli.html
/usr/share/gtk-doc/html/NetworkManager/nmtui.html
/usr/share/gtk-doc/html/NetworkManager/ref-settings.html
/usr/share/gtk-doc/html/NetworkManager/right-insensitive.png
/usr/share/gtk-doc/html/NetworkManager/right.png
/usr/share/gtk-doc/html/NetworkManager/secrets-flags.html
/usr/share/gtk-doc/html/NetworkManager/spec.html
/usr/share/gtk-doc/html/NetworkManager/style.css
/usr/share/gtk-doc/html/NetworkManager/up-insensitive.png
/usr/share/gtk-doc/html/NetworkManager/up.png