The kernel module mfip does not have a man page.
A commit references this bug: Author: brueffer Date: Sun Apr 24 11:41:36 UTC 2016 New revision: 298538 URL: https://svnweb.freebsd.org/changeset/base/298538 Log: MLINK mfi.4 to mfi_linux.4 and mfip.4 to cover these kernel modules. The mfi(4) manpage doesn't explain the modules yet, but at least we direct users to the right place. PR: 205925 Submitted by: dvl MFC after: 1 week Sponsored by: Essen Hackathon 2016 Changes: head/share/man/man4/Makefile
There is a commit referencing this PR, but it's still not closed and has been inactive for some time. Closing the PR as fixed but feel free to re-open it if the issue hasn't been completely resolved. Thanks