docs: add Settings dev guide;
a few changes to javadocs

Change-Id: I2d671aafe91e4c6e224e2a556a60dce9f93f11ae
diff --git a/docs/html/guide/guide_toc.cs b/docs/html/guide/guide_toc.cs
index 94b9773..9465f18 100644
--- a/docs/html/guide/guide_toc.cs
+++ b/docs/html/guide/guide_toc.cs
@@ -197,6 +197,9 @@
       <li><a href="<?cs var:toroot ?>guide/topics/ui/actionbar.html">
            <span class="en">Action Bar</span>
           </a></li>
+      <li><a href="<?cs var:toroot ?>guide/topics/ui/settings.html">
+            <span class="en">Settings</span>
+          </a></li>
       <li class="nav-section">
           <div class="nav-section-header"><a href="<?cs var:toroot ?>guide/topics/ui/notifiers/index.html">
               <span class="en">Notifications</span>