Log Message:-----------Add mention of duplicate connection messages from psql, per Andrew.
Modified Files:-------------- pgsql/doc/src/sgml: config.sgml (r1.20 -> r1.21) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml.diff?r1=1.20&r2=1.21)
