Man pages matching name systemd-user-runtime-dir in section 5:

systemd-user-runtime-dir.5.de	debian 11 / manpages-de
systemd-user-runtime-dir.5.en	debian 11 / systemd
systemd-user-runtime-dir.5.de	debian 12 / manpages-de
systemd-user-runtime-dir.5.en	debian 12 / systemd