Man pages matching name timesyncd.conf.d in section 5:

timesyncd.conf.d.5.de	debian 10 / manpages-de
timesyncd.conf.d.5.en	debian 10 / systemd
timesyncd.conf.d.5.en	debian 11 / systemd-timesyncd
timesyncd.conf.d.5.de	debian 12 / manpages-de
timesyncd.conf.d.5.en	debian 12 / systemd-timesyncd