Hi, it's me again...
*-freebsd-doc installed from pkg(8)
and probably others, as well, incl. translations.
The link name: www.freebsd.org/releng
link address: file:///usr/local/share/doc/releng/
should instead point to the "real" thing, unless a releng.html is installed locally with the docs, which would be a good idea.
So, unfortunately this is a unwanted consequence of running a script to change all "http://www.freebsd.org/" to local "file:///usr/local/share/doc/", which is by itself a good idea.