pgsql: Last-minute updates for release notes.

Last-minute updates for release notes.

Add entries for security issues.

Security: CVE-2015-0241 through CVE-2015-0244

Branch
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/0c93924b1698a284fe49026b24d1b436e8a01722

Modified Files
--------------
doc/src/sgml/release-9.0.sgml | 85 +++++++++++++++++++++++++++++++++++++++++
doc/src/sgml/release-9.1.sgml | 85 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 170 insertions(+)

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