doc:  Simplify mention of unique indexes for NULL control

Discussion: https://postgr.es/m/2304.1586532...@sss.pgh.pa.us

Backpatch-through: 9.5

Branch
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REL9_5_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/c7c0db90c29c8cad31dc0aeb9131acac3d048dee

Modified Files
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doc/src/sgml/indices.sgml | 22 +++-------------------
1 file changed, 3 insertions(+), 19 deletions(-)

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