docs: my second pass over the 9.6 release notes

Bruce Momjian <bruce@momjian.us>

Commit: fd5a2db774c1952567f75603dffb6d9fb0b0013d
Author: Bruce Momjian <bruce@momjian.us>
Date: 2016-08-11T03:08:47Z
Releases: 9.6.0
docs:  my second pass over the 9.6 release notes

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doc/src/sgml/release-9.6.sgml modified +93 −83

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