/usr/share/gtk-doc/html/libnm-util/ is in libnm-util-dev 1.6.2-3+deb9u2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/libnm-util/NMConnection.html
/usr/share/gtk-doc/html/libnm-util/NMSetting.html
/usr/share/gtk-doc/html/libnm-util/NMSetting8021x.html
/usr/share/gtk-doc/html/libnm-util/NMSettingAdsl.html
/usr/share/gtk-doc/html/libnm-util/NMSettingBluetooth.html
/usr/share/gtk-doc/html/libnm-util/NMSettingBond.html
/usr/share/gtk-doc/html/libnm-util/NMSettingBridge.html
/usr/share/gtk-doc/html/libnm-util/NMSettingBridgePort.html
/usr/share/gtk-doc/html/libnm-util/NMSettingCdma.html
/usr/share/gtk-doc/html/libnm-util/NMSettingConnection.html
/usr/share/gtk-doc/html/libnm-util/NMSettingDcb.html
/usr/share/gtk-doc/html/libnm-util/NMSettingGeneric.html
/usr/share/gtk-doc/html/libnm-util/NMSettingGsm.html
/usr/share/gtk-doc/html/libnm-util/NMSettingIP4Config.html
/usr/share/gtk-doc/html/libnm-util/NMSettingIP6Config.html
/usr/share/gtk-doc/html/libnm-util/NMSettingInfiniband.html
/usr/share/gtk-doc/html/libnm-util/NMSettingOlpcMesh.html
/usr/share/gtk-doc/html/libnm-util/NMSettingPPP.html
/usr/share/gtk-doc/html/libnm-util/NMSettingPPPOE.html
/usr/share/gtk-doc/html/libnm-util/NMSettingSerial.html
/usr/share/gtk-doc/html/libnm-util/NMSettingTeam.html
/usr/share/gtk-doc/html/libnm-util/NMSettingTeamPort.html
/usr/share/gtk-doc/html/libnm-util/NMSettingVPN.html
/usr/share/gtk-doc/html/libnm-util/NMSettingVlan.html
/usr/share/gtk-doc/html/libnm-util/NMSettingWimax.html
/usr/share/gtk-doc/html/libnm-util/NMSettingWired.html
/usr/share/gtk-doc/html/libnm-util/NMSettingWireless.html
/usr/share/gtk-doc/html/libnm-util/NMSettingWirelessSecurity.html
/usr/share/gtk-doc/html/libnm-util/annotation-glossary.html
/usr/share/gtk-doc/html/libnm-util/api-index-full.html
/usr/share/gtk-doc/html/libnm-util/ch01.html
/usr/share/gtk-doc/html/libnm-util/home.png
/usr/share/gtk-doc/html/libnm-util/index.html
/usr/share/gtk-doc/html/libnm-util/left-insensitive.png
/usr/share/gtk-doc/html/libnm-util/left.png
/usr/share/gtk-doc/html/libnm-util/libnm-util-NetworkManager.html
/usr/share/gtk-doc/html/libnm-util/libnm-util-NetworkManagerVPN.html
/usr/share/gtk-doc/html/libnm-util/libnm-util-nm-utils.html
/usr/share/gtk-doc/html/libnm-util/libnm-util.devhelp2
/usr/share/gtk-doc/html/libnm-util/object-tree.html
/usr/share/gtk-doc/html/libnm-util/right-insensitive.png
/usr/share/gtk-doc/html/libnm-util/right.png
/usr/share/gtk-doc/html/libnm-util/style.css
/usr/share/gtk-doc/html/libnm-util/up-insensitive.png
/usr/share/gtk-doc/html/libnm-util/up.png