doc: Add event trigger C API documentation

Peter Eisentraut <peter_e@gmx.net>

Commit: 0fe21ad8aab03172d4ac2e790479f17edcd3dbbe
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2013-07-04T01:06:20Z
Releases: 9.4.0
doc: Add event trigger C API documentation

From: Dimitri Fontaine <dimitri@2ndQuadrant.fr>

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PathChange+/−
doc/src/sgml/event-trigger.sgml modified +218 −6