pgsql: Update 9.4 release notes with feedback from the hackers list

Update 9.4 release notes with feedback from the hackers list

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/5b8de6d4676ed9eb6df4685deb601be3db4eaa24

Modified Files
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doc/src/sgml/release-9.4.sgml | 141 ++++++++++++++++++++++-------------------
1 file changed, 75 insertions(+), 66 deletions(-)

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