ZF-6808: fix typo in Route chaining docs

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@15780 44c647ce-9c0f-0410-b52a-842ac1e357ba

documentation/manual/en/module_specs/Zend_Controller-Router-Route-Chain.xml

@@ -22,7 +22,7 @@
     </note>
 
     <para>
-        When chaining programatically, there are two ways to archive this. The
+        When chaining programatically, there are two ways to achieve this. The
         first one is to create a new
         <classname>Zend_Controller_Router_Route_Chain</classname> instance and then
         calling the <code>chain</code> method multiple times with all routes