Remove wddx_deserialize from extract example (#4840)

Author: sy-records

reference/array/functions/extract.xml

@@ -170,18 +170,9 @@
   <para>
    <example>
     <title><function>extract</function> example</title>
-    <para>
-     A possible use for <function>extract</function> is to import into the
-     symbol table variables contained in an associative array returned by
-     <function>wddx_deserialize</function>.
-    </para>
     <programlisting role="php">
 <![CDATA[
 <?php
-
-/* Suppose that $var_array is an array returned from
-   wddx_deserialize */
-
 $size = "large";
 $var_array = array(
     "color" => "blue",