Add some caveats to the contrib/isn docs.

Robert Haas <rhaas@postgresql.org>

Commit: 4b6623a7e8f0f0116ff68ebfd4c98830fe59419d
Author: Robert Haas <rhaas@postgresql.org>
Date: 2010-10-20T02:48:19Z
Releases: 9.1.0
Add some caveats to the contrib/isn docs.

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PathChange+/−
doc/src/sgml/isn.sgml modified +9 −2