pgsql: Fix broken link in documentation.

Fix broken link in documentation.

HP's web server has apparently become case-sensitive sometime recently.
Per bug #13479 from Daniel Abraham. Corrected link identified by Alvaro.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/7f32dbcd73b9a75d09db386fa81c31f42e6f0d3a

Modified Files
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doc/src/sgml/runtime.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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