Remove HTML from BigInteger code example.

phpseclib/Math/BigInteger.php

@@ -242,13 +242,13 @@ class Math_BigInteger
      *
      * Here's an example:
      * <code>
-     * &lt;?php
+     * <?php
      *    include('Math/BigInteger.php');
      *
      *    $a = new Math_BigInteger('0x32', 16); // 50 in base-16
      *
      *    echo $a->toString(); // outputs 50
-     * ?&gt;
+     * ?>
      * </code>
      *
      * @param optional $x base-10 number or base-$base number if $base set.