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
------
REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/b7854a0722c58c36b726a251e76fdb813e3081c1

Modified Files
--------------
doc/src/sgml/release-8.4.sgml | 193 +++++++++++++++++++++++++++++++
doc/src/sgml/release-9.0.sgml | 257 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 450 insertions(+)

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