Log Message:
-----------
date_trunc also accepts 'quarter'. Noted by Yoshihisa Nakano.
Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.342 -> r1.343)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.342&r2=1.343)