title: not everything in phpdoc header showing up
body: <p>I'm trying to create some documentation using phpDocumentor (<code>phpdoc -d . -t output</code>) on <a href="https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/BigInteger.php" rel="nofollow noreferrer">phpseclib's Math_BigInteger</a> and had a few questions. Here's the header:</p>
  
  <pre><code>/**
   * Pure-PHP arbitrary precision integer arithmetic library.
   *
   * Supports base-2, base-10, base-16, and base-256 numbers.  Uses the GMP or BCMath extensions, if available,
   * and an internal implementation, otherwise.
   *
   * PHP versions 4 and 5
   *
   * {@internal (all DocBlock comments regarding implementation - such as the one that follows - refer to the 
   * {@link MATH_BIGINTEGER_MODE_INTERNAL MATH_BIGINTEGER_MODE_INTERNAL} mode)
  </code></pre>
  
  <p>Here's phpDoc's rendering:</p>
  
  <p><a href="http://www.frostjedi.com/terra/dev/phpdoc/classes/Math_BigInteger.html" rel="nofollow noreferrer">http://www.frostjedi.com/terra/dev/phpdoc/classes/Math_BigInteger.html</a></p>
  
  <p>As can be seen nothing after "Supports base-2, base-10, base-16, and base-256 numbers." is showing up. Any ideas as to why?</p>
  
  <p>Also, I tried doing <code>phpdoc -pp -d . -t output</code> to see the internal text in the header but that's not working either. Probably for the same reason.</p>
  
  <p>Here's where I'm expecting it to show up:</p>
  
  <p><img src="https://i.imgur.com/sDNa1FM.png" alt="enter image description here"></p>
  
  <p>Any ideas? Thanks!</p>