> there literally isn’t any documentation of LibreSSL.
This is plain wrong, it's particularly annoying as a great deal of effort has been put into updating the documentation [1].
> Instead, you just have to read the OpenSSL docs, and just hope the behavior is roughly the same.
I'll give the author the benefit of the doubt and assume they refer the "OpenSSL docs" as naming hasn't been changed, as opposed to looking at actual OpenSSL documentation. Indeed it doesn't make a great sense rename everything in the documents because as the LibreSSL website states.
libssl: a TLS library, backwards-compatible with OpenSSL
libtls: a new TLS library, designed to make it easier to write foolproof applications