pgsql: 9.4 release notes: adjust some entry wording

9.4 release notes: adjust some entry wording

Backpatch to 9.4

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/a52f2a0b9cf6767d8c82bbc63725657bd84571d8

Modified Files
--------------
doc/src/sgml/release-9.4.sgml | 38 +++++++++++++++-----------------------
1 file changed, 15 insertions(+), 23 deletions(-)

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