docs: change intro and title for contacts and sign-in lesson, and remove empty bullet

b/22822607

Change-Id: Ib8b26e2ebe651fc3d9a1b9c89183ab62128d5e20

docs/html/training/building-userinfo.jd

@@ -1,9 +1,9 @@
-page.title=Building Apps with User Info & Location
+page.title=Building Apps with Contacts & Sign-In
 page.trainingcourse=true
 
 @jd:body
 
 
-<p>These classes teach you how to add user personalization to your app. Some of the ways
+<p>These lessons teach you how to include contact information and authenticate users with the same 
-you can do this is by identifying users, providing
+credentials they use for Google. These features allow your app to connect users with people they 
-information that's relevant to them, and providing information about the world around them.</p>
+care about and provide a personalized experience without creating new user accounts.</p>

docs/html/training/contacts-provider/retrieve-names.jd

@@ -730,7 +730,6 @@ public class ContactsFragment extends Fragment implements
     <li>
         Define ListView and item layouts.
     </li>
-    <li>
     <li>
         Define a Fragment that displays the list of contacts.
     </li>

docs/html/training/training_toc.cs

@@ -811,7 +811,7 @@ include the action bar on devices running Android 2.1 or higher."
     <div class="nav-section-header">
       <a href="<?cs var:toroot ?>training/building-userinfo.html">
       <span class="small">Building Apps with</span><br/>
-              User Info &amp; Sign-In
+              Contacts &amp; Sign-In
       </a>
     </div>
     <ul>