Add mention of quotes on function body to NOTES section.

Oliver Elphick

doc/src/sgml/ref/create_function.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.52 2003/09/11 21:42:20 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.53 2003/10/26 04:34:05 momjian Exp $
 -->
 
 <refentry id="SQL-CREATEFUNCTION">
@@ -354,10 +354,16 @@ CREATE [ OR REPLACE ] FUNCTION <replaceable class="parameter">name</replaceable>
     to remove user-defined functions.
    </para>
 
+  <para>
+   Any single quotes or backslashes in the function definition must be
+   escaped by doubling them.
+  </para>
+
    <para>
     To be able to define a function, the user must have the
     <literal>USAGE</literal> privilege on the language.
    </para>
+
  </refsect1>
 
  <refsect1 id="sql-createfunction-examples">