Update URL reference material in /contrib/isn docs

Bruce Momjian <bruce@momjian.us>

Commit: 4b91ade41fcda805a50e136edad7f95d8f35a7a9
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-09-03T21:22:20Z
Releases: 9.5.0
Update URL reference material in /contrib/isn docs

Report by Peter Eisentraut

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doc/src/sgml/isn.sgml modified +3 −1