The best way to report obvious errors on not editable wiki pages in general would be to write directly to
andi@splitbrain.org, I think ...
If those errors are arguable, they could be discussed on the mailinglist beforehand.
But as wiki:syntax belongs to dokuwiki itself (it is part of every installation), those errors should either be reported here in this bug tracker (with Category: other) or in the mailinglist (http://wiki.splitbrain.org/wiki:mailinglist).