Added help documentation for bullet code

index.html

             You can use this to vertically center text by adding one of these before and after the text you want to center.
             Param1: the number of units of empty space to use.
         </li>
+        <li>
+            <code>bullet</code>
+            A bulleted text line.
+            Param1: the text
+        </li>
     </ul>
 </p>