pgsql: doc: fix typo in release notes

doc: fix typo in release notes

Backpatch through 8.4

Per suggestion by Amit Langote

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/5fbed6b1e1f9e7145679a9f90b5f8b6587f9cc19

Modified Files
--------------
doc/src/sgml/release-8.4.sgml | 4 ++--
doc/src/sgml/release-9.0.sgml | 4 ++--
doc/src/sgml/release-9.1.sgml | 4 ++--
doc/src/sgml/release-9.2.sgml | 4 ++--
4 files changed, 8 insertions(+), 8 deletions(-)

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