Log Message:
-----------
Document that syncronhous commit can be turned off in a single
multi-statement transaction.
Modified Files:
--------------
pgsql/doc/src/sgml:
config.sgml (r1.152 -> r1.153)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml?r1=1.152&r2=1.153)