Docs: Revising Graphics page and adding related images.

Bug: 13785467
Change-Id: I52878af8823a322e4311c3d1b6e3279d824e39d5

Conflicts:
	src/index.jd
diff --git a/src/devices/devices_toc.cs b/src/devices/devices_toc.cs
index b18dc75..44cbdd1 100644
--- a/src/devices/devices_toc.cs
+++ b/src/devices/devices_toc.cs
@@ -90,7 +90,8 @@
           </a>
         </div>
         <ul>
-          <li><a href="<?cs var:toroot ?>devices/graphics/architecture.html">System-Level Architecture</a></li>
+          <li><a href="<?cs var:toroot ?>devices/graphics/architecture.html">Architecture</a></li>
+          <li><a href="<?cs var:toroot ?>devices/graphics/implement.html">Implementation</a></li>
         </ul>
       </li>
       <li class="nav-section">