Correct UNDER syntax.

doc/src/sgml/advanced.sgml

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+$Header: /cvsroot/pgsql/doc/src/sgml/advanced.sgml,v 1.19 2000/12/30 19:11:45 petere Exp $
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  <chapter id="advanced">
@@ -33,9 +33,9 @@ CREATE TABLE cities (
     altitude        int     -- (in ft)
 );
 
-CREATE TABLE capitals (
+CREATE TABLE capitals UNDER cities (
     state           char(2)
-) UNDER cities;
+);
     </programlisting>
 
     In this case, an  instance  of  capitals  <firstterm>inherits</firstterm>  all