fix the lesson title names

Change-Id: I09ba41685664b92b5082376a8b9e885bf444415f

Author: scottamain

docs/html/training/basics/data-storage/index.jd

@@ -41,11 +41,11 @@ file</li>
 <h2>Lessons</h2>
 
 <dl>
-  <dt><b><a href="shared-preferences.html">Saving Data in Shared Preferences</a></b></dt>
+  <dt><b><a href="shared-preferences.html">Saving Key-Value Sets</a></b></dt>
     <dd>Learn to use a shared preferences file for storing small amounts of information in
 key-value pairs.</dd>
 
-  <dt><b><a href="files.html">Saving Data in Files</a></b></dt>
+  <dt><b><a href="files.html">Saving Files</a></b></dt>
     <dd>Learn to save a basic file, such as to store long sequences of data that
         are generally read in order.</dd>