pgsql: release notes: abbreviated key speedup only for varchar/text

release notes: abbreviated key speedup only for varchar/text

Report by Peter Geoghegan

Backpatch through 9.5

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/ce56a649cf0b9aba41d68481895b3da0a82981d4

Modified Files
--------------
doc/src/sgml/release-9.5.sgml | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

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