Both net/howl and net/mDNSResponder install (different) mDNSResponder.8 man pages.
net/mDNSResponder should install its man page as mDNSResponderPosix.8
How-To-Repeat: The last package added overwrites the other's file.
The suggestion is to fix mDNSResponder to install its man page to
I'm handling an update to mDNSResponder.
A fix was committed. Thanks for the report!