Fixed Android U Enterprise lesson pre-requisites and a minor typo.

Change-Id: Ide393a0957f3e797f14d7c349c35337849b15f02

Author: Fred Chung

docs/html/training/enterprise/device-management-policy.jd

@@ -33,7 +33,7 @@ class="button">Download the sample</a>
 </div>
 
 
-<p>Since Android 2.2 (API level 8), the Android platform offes system-level device management
+<p>Since Android 2.2 (API level 8), the Android platform offers system-level device management
 capabilities through the Device Administration APIs.</p>
 
 <p>In this lesson, you will learn how to create a security-aware application that manages access to

docs/html/training/enterprise/index.jd

@@ -13,9 +13,7 @@ next.link=device-management-policy.html
 <!-- Required platform, tools, add-ons, devices, knowledge, etc. -->
 <h2>Dependencies and prerequisites</h2>
 <ul>
-  <li>Android 2.0 (API Level 5) or higher</li>
-  <li>Experience with <a href="{@docRoot}guide/topics/media/mediaplayer.html">Media
-Playback</a></li>
+  <li>Android 2.2 (API Level 8) or higher</li>
 </ul>
 
 <!-- related docs (NOT javadocs) -->