pgsql: docs: update release notes for 8.4.18, 9.0.14, 9.1.10, 9.2.5, 9

docs: update release notes for 8.4.18, 9.0.14, 9.1.10, 9.2.5, 9.3.1

Branch
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REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/56e90da8da137c5a91c4086970b721c5ef7d6871

Modified Files
--------------
doc/src/sgml/release-8.4.sgml | 193 +++++++++++++++++++++++++
doc/src/sgml/release-9.0.sgml | 257 +++++++++++++++++++++++++++++++++
doc/src/sgml/release-9.1.sgml | 321 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 771 insertions(+)

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