pgsql: First-draft release notes for 9.5.3.

First-draft release notes for 9.5.3.

As usual, the release notes for other branches will be made by cutting
these down, but put them up for community review first.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/eb7de00ac2d282263541ece849ec71e2809e9467

Modified Files
--------------
doc/src/sgml/release-9.5.sgml | 474 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 474 insertions(+)

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