Fix sample INSTR function to return 0 if third arg is 0.

Albe Laurenz, per a report by Greg Smith that our sample function
doesn't quite match Oracle's behavior.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/0fc32c00d74404a9a535e0e1b8d9437dfd8075db

Modified Files
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doc/src/sgml/plpgsql.sgml |    8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)


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