84e3e19af9
ddclient added the ipv6 without patch in 3.8.1, as said on the web interface (8c391cca88/src/nsupdate/main/templates/main/includes/tabbed_router_configuration.html (L175)
).
Almost all distributions (if not all) have a version greater than 3.8.1. Thus, the documentation can be updated to reflect the current support of ipv6.