NumberFormatter::format() does not support ::TYPE_CURRENCY

Cf. <php/php-src#9421>.

Author: cmb69

reference/intl/numberformatter/format.xml

@@ -59,6 +59,8 @@
        The
        <link linkend="intl.numberformatter-constants.types">
         formatting type</link> to use.
+       Note that <constant>NumberFormatter::TYPE_CURRENCY</constant> is not supported;
+       use <methodname>NumberFormatter::formatCurrency</methodname> instead.
       </para>
      </listitem>
     </varlistentry>