doc: Add missing include in example code

It's not broken because the header file is included via other headers,
but for better style we should be more explicit.

Reported-by: mthrockmor...@hme.com

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/aa09b9dcd57cbf18516332bf8310c12ef6f83715

Modified Files
--------------
doc/src/sgml/trigger.sgml | 1 +
1 file changed, 1 insertion(+)


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