libressl has documentation. it's an OpenBSD project so you use the man pages.
* https://marc.info/?l=openbsd-misc&m=139819485423701&w=2
"Note that FIPS mode isn't just worthless, it's actively harmful."
https://marc.info/?l=openbsd-misc&m=139819485423701&w=2
No one that cares enough to use LibreSSL over OpenSSL would want FIPS as reintroducing it would make LibreSSL demonstrably worse. Anyone that requires FIPS doesn't know or care enough about security to have a dog in the fight.
This is news to me! All I can say is, "Godspeed, Ted Unangst."
I'm constantly thankful that I'm able to work somewhere that I don't have to worry about other people's bogus security checkboxes.