Update ISO 3166 link

The old one no longer pointed to anything useful.

Branch
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REL8_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/a5dbb053b3c60c8fd7ea32f6356c0f1eb1e381a1

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

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