pgsql: Recommend triggers, not rules, in the CREATE VIEW reference page

Recommend triggers, not rules, in the CREATE VIEW reference page.

We've generally recommended use of INSTEAD triggers over rules since that
feature was added; but this old text in the CREATE VIEW reference page
didn't get the memo.  Noted by Thomas Kellerer.

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/f7968554ab20e18a78f8e21bda9ff8445f81773f

Modified Files
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doc/src/sgml/ref/create_view.sgml |    7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)