DOC: specified encoding limitations on windows with icu

Author: Liudmila Mantrova

doc/src/sgml/charset.sgml

@@ -588,8 +588,8 @@ SELECT * FROM test1 ORDER BY a || b COLLATE "fr_FR";
      Instead, you must use canonical locale names supported on your
      operating system. For example, <literal>"ru-RU"</literal> or
      <literal>"en-US"</literal>. Specifying the encoding with these
-     options is not allowed either. If you need to provide the encoding,
-     use the <literal>--encoding</literal> option. For details on
+     options is not allowed either. If required, you can specify the
+     UTF8 encoding using the <literal>--encoding</literal> option. For details on
      the supported encodings, see <xref linkend="multibyte-charset-supported">.
     </para>
    </important>