/usr/share/doc/ECM/html/find-module/ is in extra-cmake-modules 5.44.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/ECM/html/find-module/FindEGL.html
/usr/share/doc/ECM/html/find-module/FindGLIB2.html
/usr/share/doc/ECM/html/find-module/FindKF5.html
/usr/share/doc/ECM/html/find-module/FindLibGit2.html
/usr/share/doc/ECM/html/find-module/FindOpenEXR.html
/usr/share/doc/ECM/html/find-module/FindPng2Ico.html
/usr/share/doc/ECM/html/find-module/FindPoppler.html
/usr/share/doc/ECM/html/find-module/FindPulseAudio.html
/usr/share/doc/ECM/html/find-module/FindQtWaylandScanner.html
/usr/share/doc/ECM/html/find-module/FindSasl2.html
/usr/share/doc/ECM/html/find-module/FindSharedMimeInfo.html
/usr/share/doc/ECM/html/find-module/FindWayland.html
/usr/share/doc/ECM/html/find-module/FindWaylandScanner.html
/usr/share/doc/ECM/html/find-module/FindX11_XCB.html
/usr/share/doc/ECM/html/find-module/FindXCB.html