Fix erroneous documentation of the syntax of CREATE CONSTRAINT TRIGGER.
Fix erroneous documentation of the syntax of CREATE CONSTRAINT TRIGGER.

The grammar requires a specific ordering of the clauses, but the
documentation showed a different order.  This error was introduced in
commit b47953f9c69d48a9261bd643e3170017b93f6337, which merged the CREATE
CONSTRAINT TRIGGER documentation into the CREATE TRIGGER page.  There is
no code bug AFAICS.

tpostgres-projects/tPostgres,yazun/postgres-xl,snaga/postgres-xl,yazun/postgres-xl,kmjungersen/PostgresXL,pavanvd/postgres-xl,oberstet/postgres-xl,ashwinstar/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,yazun/postgres-xl,50wu/gpdb,50wu/gpdb,jmcatamney/gpdb,snaga/postgres-xl,arcivanov/postgres-xl,greenplum-db/gpdb,50wu/gpdb,kmjungersen/PostgresXL,oberstet/postgres-xl,xinzweb/gpdb,snaga/postgres-xl,jmcatamney/gpdb,yazun/postgres-xl,postmind-net/postgres-xl,xinzweb/gpdb,techdragon/Postgres-XL,greenplum-db/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,adam8157/gpdb,greenplum-db/gpdb,pavanvd/postgres-xl,greenplum-db/gpdb,ovr/postgres-xl,Postgres-XL/Postgres-XL,greenplum-db/gpdb,arcivanov/postgres-xl,adam8157/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,tpostgres-projects/tPostgres,ovr/postgres-xl,zeroae/postgres-xl,snaga/postgres-xl,tpostgres-projects/tPostgres,adam8157/gpdb,oberstet/postgres-xl,xinzweb/gpdb,postmind-net/postgres-xl,Postgres-XL/Postgres-XL,xinzweb/gpdb,pavanvd/postgres-xl,kmjungersen/PostgresXL,greenplum-db/gpdb,lisakowen/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,techdragon/Postgres-XL,xinzweb/gpdb,arcivanov/postgres-xl,arcivanov/postgres-xl,ashwinstar/gpdb,techdragon/Postgres-XL,xinzweb/gpdb,xinzweb/gpdb,tpostgres-projects/tPostgres,yazun/postgres-xl,adam8157/gpdb,lisakowen/gpdb,ashwinstar/gpdb,lisakowen/gpdb,lisakowen/gpdb,jmcatamney/gpdb,oberstet/postgres-xl,techdragon/Postgres-XL,techdragon/Postgres-XL,50wu/gpdb,50wu/gpdb,lisakowen/gpdb,oberstet/postgres-xl,adam8157/gpdb,lisakowen/gpdb,kmjungersen/PostgresXL,ashwinstar/gpdb,50wu/gpdb,50wu/gpdb,pavanvd/postgres-xl,postmind-net/postgres-xl,ovr/postgres-xl,adam8157/gpdb,pavanvd/postgres-xl,kmjungersen/PostgresXL,greenplum-db/gpdb,snaga/postgres-xl,ovr/postgres-xl,adam8157/gpdb,xinzweb/gpdb,jmcatamney/gpdb,postmind-net/postgres-xl,lisakowen/gpdb,Postgres-XL/Postgres-XL,adam8157/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,arcivanov/postgres-xl,zeroae/postgres-xl,ashwinstar/gpdb,lisakowen/gpdb,ashwinstar/gpdb,postmind-net/postgres-xl,jmcatamney/gpdb,tpostgres-projects/tPostgres,greenplum-db/gpdb,zeroae/postgres-xl,ovr/postgres-xl