Most of all, the base X509_LOOKUP functionality is now documented.
Furthermore, the names X509_LOOKUP_METHOD and X509_STORE are added for
reference.
Some functions were moved from X509_LOOKUP_meth_new.pod
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/10986)
