Log Message:
-----------
Adjust extract(epoch) example to clarify that it includes fractional
seconds, per gripe from Richard Neill. Also, add a cross-reference to
the to_timestamp function.
Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.484 -> r1.485)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.484&r2=1.485)