pgsql: Update release notes for 9.2.3, 9.1.8, 9.0.12, 8.4.16, 8.3.23.

Update release notes for 9.2.3, 9.1.8, 9.0.12, 8.4.16, 8.3.23.

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/0499ff2567475ccd93b07183d4bb44d29ba1c006

Modified Files
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doc/src/sgml/release-8.3.sgml | 156 ++++++++++++++++++++++++++
doc/src/sgml/release-8.4.sgml | 197 ++++++++++++++++++++++++++++++++
doc/src/sgml/release-9.0.sgml | 249 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 602 insertions(+), 0 deletions(-)

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