mousedrv(4) gives the wrong section number for hald(8) in section CONFIGURATION DETAILS. it's a bit of a nuisance when reading it on the web, link: https://www.freebsd.org/cgi/man.cgi?query=mousedrv&sektion=4&manpath=freebsd-release-ports#CONFIGURATION_DETAILS it will confuse a few readers using the man command too. i'm thinking back to how my mind worked (: or didn't :) when i was learning the ins and outs of linux; a small documentation glitch could get me quite stuck.
While I agree with you this documentation should be fixed, this is not actually a bug in FreeBSD. It should be fixed upstream with the x.org folk.