doc: Fix broken links to DocBook wiki

Branch
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REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/1b4359b55d8fe32a54460c3ea00567a2fafa6b9c

Modified Files
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doc/src/sgml/docguide.sgml |    4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

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