pgsql: Change PROCEDURE to FUNCTION in CREATE TRIGGER syntax

Change PROCEDURE to FUNCTION in CREATE TRIGGER syntax

Since procedures are now a different thing from functions, change the
CREATE TRIGGER and CREATE EVENT TRIGGER syntax to use FUNCTION in the
clause that specifies the function.  PROCEDURE is still accepted for
compatibility.

pg_dump and ruleutils.c output is not changed yet, because that would
require a change in information_schema.sql and thus a catversion change.

Reported-by: Peter Geoghegan <pg@bowt.ie>
Reviewed-by: Jonathan S. Katz <jonathan.katz@excoventures.com>

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/0a63f996e018ac508c858e87fa39cc254a5db49f

Modified Files
--------------
doc/src/sgml/ddl.sgml                      |  2 +-
doc/src/sgml/event-trigger.sgml            |  4 ++--
doc/src/sgml/func.sgml                     |  6 +++---
doc/src/sgml/information_schema.sgml       |  2 +-
doc/src/sgml/lo.sgml                       |  2 +-
doc/src/sgml/plperl.sgml                   |  4 ++--
doc/src/sgml/plpgsql.sgml                  | 16 ++++++++--------
doc/src/sgml/pltcl.sgml                    |  4 ++--
doc/src/sgml/ref/create_event_trigger.sgml | 12 ++++++++++--
doc/src/sgml/ref/create_trigger.sgml       | 24 ++++++++++++++++--------
doc/src/sgml/tcn.sgml                      |  2 +-
doc/src/sgml/textsearch.sgml               |  4 ++--
doc/src/sgml/trigger.sgml                  |  4 ++--
src/backend/parser/gram.y                  |  9 +++++++--
src/test/regress/expected/triggers.out     |  4 ++--
src/test/regress/sql/triggers.sql          |  4 ++--
16 files changed, 62 insertions(+), 41 deletions(-)