changed "zend.serializer.introduction.example.static.php" from sect2 to example

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@20733 44c647ce-9c0f-0410-b52a-842ac1e357ba

documentation/manual/en/module_specs/Zend_Serializer-Introduction.xml

@@ -71,7 +71,7 @@ try {
         method.
     </para>
 
-    <sect2 id="zend.serializer.introduction.example.static.php">
+    <example id="zend.serializer.introduction.example.static.php">
         <title>Using the Zend_Serializer static interface</title>
 
         <para>
@@ -94,7 +94,7 @@ try {
     echo $e; 
 } 
 ]]></programlisting>
-    </sect2>
+    </example>
 </sect1>
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