pgsql: Small 9.6 release note improvements.

Small 9.6 release note improvements.

Sync release notes through today, and incorporate some suggestions
from Robert Haas.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/2f38b986fa8ff048c7226f1ca212e12084c715cf

Modified Files
--------------
doc/src/sgml/release-9.6.sgml | 69 +++++++++++++++++++++++++++----------------
1 file changed, 43 insertions(+), 26 deletions(-)

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