Bug 239523 [TabbedProperties] Three JavaDoc warnings
I noticed there are three JavaDoc warnings in the org.eclipse.ui.views.properties.tabbed, there should be zero warnings and errors.
bundles/org.eclipse.ui.views.properties.tabbed/src/org/eclipse/ui/internal/views/properties/tabbed/view/TabbedPropertyList.java
e.gc.drawLine(middle, 4, middle + 1, 4);
				e.gc.drawLine(middle - 1, 5, middle + 2, 5);
				e.gc.drawLine(middle - 2, 6, middle + 3, 6);
				e.gc.setForeground(widgetNormalShadow);
				e.gc.drawLine(0, 0, bounds.width - 2, 0);
				e.gc.setForeground(navigationElementShadowStroke);
				e.gc.drawLine(0, 1, bounds.width - 2, 1);
				e.gc.drawLine(0, bounds.height - 1, bounds.width - 2,
						bounds.height - 1);
			}
		}
	}
	/**
	 * The top navigation element in the tabbed property list. It looks like a
	 * scroll button when scrolling is needed or is just a spacer when no
	 * scrolling is required.
	 */
	public class BottomNavigationElement extends Canvas {
		/**
		 * Constructor for BottomNavigationElement.
		 * 
		 * @param parent
		 *            the parent Composite.
		 */
		public BottomNavigationElement(Composite parent) {
			super(parent, SWT.NO_FOCUS);
			addPaintListener(new PaintListener() {
				public void paintControl(PaintEvent e) {
					paint(e);
				}