Update URL reference material in /contrib/isn docs

Report by Peter Eisentraut

diff --git a/doc/src/sgml/isn.sgml b/doc/src/sgml/isn.sgml
index 4a2e7da76300f9606cb9debbf86b33147a6dcca0..c1da702df63ca226d041dbde1cd025297f97c9e1 100644 (file)
--- a/doc/src/sgml/isn.sgml
+++ b/doc/src/sgml/isn.sgml
@@ -364,7 +364,9 @@ SELECT isbn13(id) FROM test;
    The prefixes used for hyphenation were also compiled from:
    
     
-    
+    
+    
+