Add caution about multiple unique indexes breaking plpgsql upsert example.
Per Phil Sorber, though I didn't use his wording exactly.
Branch------master
Details-------http://git.postgresql.org/pg/commitdiff/ed6e0545f5f6e9977c8410e04244138b567c5a73
Modified Files--------------doc/src/sgml/plpgsql.sgml | 5 ++++-1 files changed, 4 insertions(+), 1 deletions(-)
