Merge docs for CREATE CONSTRAINT TRIGGER and CREATE TRIGGER

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: b47953f9c69d48a9261bd643e3170017b93f6337
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2010-11-09T19:52:46Z
Releases: 9.1.0
Merge docs for CREATE CONSTRAINT TRIGGER and CREATE TRIGGER

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