Log Message:
-----------
Add missing markup for translatability
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
create_aggregate.sgml (r1.40 -> r1.41)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_aggregate.sgml?r1=1.40&r2=1.41)