Move -nameopt to openssl.pod

Also clarify the description of the options.

Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/10259)
9 files changed