The pw(8) manpage talks about the -L option twice. One entry looks like it has
been there for a long time - before login classes actually worked.
I've updated the manpage in revision 184.108.40.206 in RELENG_4 as a result
of another PR (docs/34782). If you grab the updated sources, you
should see that now there is only one place where -L is described.
Thank you, for reporting this though :)