docs: my third pass over the 9.6 release notes

Bruce Momjian <bruce@momjian.us>

Commit: dd028e904c67dae5f5d51da73628a8bd3cb1f5f1
Author: Bruce Momjian <bruce@momjian.us>
Date: 2016-08-17T03:05:13Z
Releases: 9.6.0
docs:  my third pass over the 9.6 release notes

Backpatch-through: 9.6

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doc/src/sgml/release-9.6.sgml modified +332 −296

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