Mention CardDAV rather than GroupDAV as supported protocol
GroupDAV has been superseded by CalDAV/CardDAV more than a decade ago.
I've also looked into deprecating that entirely for 6 (driven by the XQuery use in KDAV), all our supported groupware servers have long switched, except one, Citadel. They are still stuck on GroupDAV exclusively. So I guess we have to drag this along for another decade...