Log Message:
-----------
Document clearly the meaning of none/all for log_statements.
Modified Files:
--------------
pgsql/doc/src/sgml:
config.sgml (r1.253 -> r1.254)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml?r1=1.253&r2=1.254)