Document that the semicolon following the final "END" in a function body

is optional.

doc/src/sgml/plpgsql.sgml

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+$PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.48 2004/10/04 05:42:18 neilc Exp $
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 <chapter id="plpgsql"> 
@@ -437,7 +437,8 @@ END;
 
     <para>
      Each declaration and each statement within a block is terminated
-     by a semicolon.
+     by a semicolon, although the final <literal>END</literal> that
+     concludes a function body does not require one.
     </para>
 
     <para>