Clarify documentation of to_char EEEE pattern

doc/src/sgml/func.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.511 2010/04/03 07:22:54 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.512 2010/04/03 07:53:02 petere Exp $ -->
 
  <chapter id="functions">
   <title>Functions and Operators</title>
@@ -5473,8 +5473,8 @@ SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1,3})');
      <listitem>
       <para>
        <literal>EEEE</literal> (scientific notation) cannot be used in
-       combination with any of the other special formatting patterns or
-       modifiers, and must be at the end of the format string
+       combination with any of the other formatting patterns or
+       modifiers other than digit and decimal point patterns, and must be at the end of the format string
        (e.g., <literal>9.99EEEE</literal> is a valid pattern).
       </para>
      </listitem>