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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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/505f78c446b0a149efb93ec61350e36ddc306152

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

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