I was looking over http://www.gnucash.org/develdocs.phtml and see in the Writers section that there is a link to "Gnome's bugzilla database." (the link is correctly pointing to bugs.gnucash.org) I should think this link and any others on the website (and wiki) should all have their anchor text refactored appropriately.
I went through source, documentation and website and replaced all occurences I found except for the older news items on the website. I also checked the wiki, but it looks like all has been cleaned up there already. So I'll close this bug now. Thanks for reporting it.
Sometimes I still find places, were the URL was updated, but not the link text. But that is not so important.