pgsql: Last-minute updates for release notes.

Last-minute updates for release notes.

Revise description of CVE-2015-3166, in line with scaled-back patch.
Change release date.

Security: CVE-2015-3166

Branch
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/5b461f239eae2ad67f268e31ada7d79331b89652

Modified Files
--------------
doc/src/sgml/release-9.0.sgml | 26 ++++++++++++++++----------
doc/src/sgml/release-9.1.sgml | 26 ++++++++++++++++----------
2 files changed, 32 insertions(+), 20 deletions(-)

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