[DOCUMENTATION] English: fix compilation error

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@22858 44c647ce-9c0f-0410-b52a-842ac1e357ba

documentation/manual/en/module_specs/Zend_Validate-Hostname.xml

@@ -100,7 +100,7 @@ if ($validator->isValid($hostname)) {
 
         <para>
             Additionally there is <constant>ALLOW_URI</constant> which allows to check hostnames
-            according to <link linkend="http://tools.ietf.org/html/rfc3986">RFC3986</link>. These
+            according to <ulink url="http://tools.ietf.org/html/rfc3986">RFC3986</ulink>. These
             are registered names which are used by <acronym>WINS</acronym>, NetInfo and also local
             hostnames like those defined within your <filename>.hosts</filename> file. For security
             reasons <constant>ALLOW_URI</constant> is not contained within