Description:
------------
PhD 0_4 links to "unknown types" (<types>) in some cases (methodsynopsis for example), such as "callback" and classnames.

This doesn't seem to be the case in Enterprise PhD anymore.


Reproduce code:
---------------
  <methodsynopsis>
   <type>DOMNode</type><methodname>DOMNode::insertBefore</methodname>
   <methodparam><type>DOMNode</type><parameter>newnode</parameter></methodparam>
   <methodparam choice="opt"><type>DOMNode</type><parameter>refnode</parameter></methodparam>
  </methodsynopsis>


Expected result:
----------------
  <div class="methodsynopsis dc-description">
   <span class="type"><a href="class.domnode.php" class="type DOMNode">DOMNode</a></span> <span class="methodname"><b>DOMNode::insertBefore</b></span>
    ( <span class="methodparam"><span class="type"><a href="class.domnode.php" class="type DOMNode">DOMNode</a></span> <tt class="parameter">$newnode</tt></span>

   [, <span class="methodparam"><span class="type"><a href="class.domnode.php" class="type DOMNode">DOMNode</a></span> <tt class="parameter">$refnode</tt></span>
  ] )</div>


Actual result:
--------------
  <div class="methodsynopsis dc-description">
    <span class="type">DOMNode</span> DOMNode::insertBefore
    ( <span class="methodparam"> <span class="type">DOMNode</span>  <tt class="parameter">$newnode</tt></span>

   [, <span class="methodparam"> <span class="type">DOMNode</span>  <tt class="parameter">$refnode</tt></span>
  ] )</div>