pgsql: PL/pgSQL docs: recommend format() for query construction

PL/pgSQL docs: recommend format() for query construction

Previously only concatenation was recommended.

Report by Pavel Stehule

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/0e1f6d8132b4da3e0727bb4918b9ea51446a9c41

Modified Files
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doc/src/sgml/func.sgml | 5 +++--
doc/src/sgml/plpgsql.sgml | 54 ++++++++++++++++++++++++++++-----------------
2 files changed, 37 insertions(+), 22 deletions(-)

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