Update demos/bio/README

demos/bio/README

 This directory contains some simple examples of the use of BIO's
 to simplify socket programming.
 
-The client-conf and client-arg include examples of how to use the SSL_CONF
-API for configuration file or command line processing.
+The client-conf, server-conf, client-arg and client-conf include examples
+of how to use the SSL_CONF API for configuration file or command line
+processing.