pgsql: doc: fix typo in release notes

doc: fix typo in release notes

Backpatch through 8.4

Per suggestion by Amit Langote

Branch
------
REL9_0_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/ca4967903dff9e7ac86d4a146a4aebc9046009b0

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

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