pgsql: Improve documentation about search_path for SECURITY DEFINER fun

Improve documentation about search_path for SECURITY DEFINER functions.

Clarify that the reason for recommending that pg_temp be put last is to
prevent temporary tables from capturing unqualified table names. Per
discussion with Albe Laurenz.

Discussion: <A737B7A37273E048B164557ADEF4A58B5386C6E1@ntex2010i.host.magwien.gv.at>

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/ce150e7e0fc1a127fee7933d71f4204a79ecce04

Modified Files
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doc/src/sgml/ref/create_function.sgml | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)

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