Document the invariants for the empty X509_NAME encoding
Document the invariants for the empty X509_NAME encoding

Reviewed-by: David von Oheimb <fbbca6c63636e78e7034aaf1b4aa3a9736383192@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/14832)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl