doc:  mention trigger helper functions in CREATE TRIGGER docs

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.5

Branch
------
REL9_6_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/9ac3b6f9d2627585e0d824548a4c09a3c7678d09

Modified Files
--------------
doc/src/sgml/ref/create_trigger.sgml | 6 ++++++
1 file changed, 6 insertions(+)

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