This is untrue. The front page contains links to the documentation inline, OpenBSD/LibreSSL converted all of OpenSSL's awful perlpod documentation to semantic mdoc(5) markup, and even wrote new man pages for functions completely undocumented by OpenSSL.
See Ingo Schwarze' EuroBSDCon 2018 talk "Better documentation - on the web and for LibreSSL"
https://www.openbsd.org/papers/eurobsdcon2018-mandoc.pdf
And earlier writeups from 2016.
https://undeadly.org/cgi?action=article;sid=20161215221715
It's been a long road to improve the documentation, and it's substantially better than OpenSSL.