      * 
      *  <p>The VScrollBar and HScrollBar classes override these methods to 
      *  keep their <code>pageSize</code>, <code>maximum</code>, and <code>value</code> properties in sync with the
-     *  viewport.   Similarly, they override their <code>changeValueByPage()</code> and <code>changeValueByStep()</code> methods to
+     *  viewport. Similarly, they override their <code>changeValueByPage()</code> and <code>changeValueByStep()</code> methods to
      *  use the viewport's <code>scrollPositionDelta</code> methods to compute page and
      *  and step offsets.</p>
      *    

 *    the minimum range value and the maximum range value.</li>
 *  </ul>
 *
 *  @see spark.core.IViewport
 *  @see spark.skins.spark.ScrollerSkin
 *  @see spark.skins.spark.ScrollBarDownButtonSkin

     *  smaller than the current value. 
     *  The minimum value of <code>value</code> is <code>pageSize</code>. 
     *
     *  @param increase Whether the paging action adds (<code>true</code>) or
     *  decreases (<code>false</code>) <code>value</code>. 
     *  
     *  @langversion 3.0
