Docs: HWC2 updates, new section+subsections
      Removing Framebuffer bullet
      Making OpenGL 3.x drivers optional
      Fixing horrendous typo in nav
      Adding Clay's feedback

Bug: 28419158

Change-Id: I19ce49d22f7bdb54229363580d9075f71037ef9c
diff --git a/src/devices/graphics/index.jd b/src/devices/graphics/index.jd
index 4ce174f..b618909 100644
--- a/src/devices/graphics/index.jd
+++ b/src/devices/graphics/index.jd
@@ -206,7 +206,7 @@
 implemented their own implicit synchronization within their own drivers. This
 is no longer required with the Android graphics synchronization framework. See
 the
-<a href="{@docRoot}devices/graphics/implement.html#explicit_synchronization">Explicit
+<a href="{@docRoot}devices/graphics/implement-vsync.html#explicit_synchronization">Explicit
 synchronization</a> section for implementation instructions.</p>
 
 <p>The synchronization framework explicitly describes dependencies between