Minor copy-editing in CREATE TRIGGER reference page.

Per suggestions from Thom Brown and Robert Haas.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/f8c0af840d84086249647d4415bd35903bfc7933

Modified Files
--------------
doc/src/sgml/ref/create_trigger.sgml |   21 ++++++++++++++-------
1 files changed, 14 insertions(+), 7 deletions(-)

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