Add a link to the PackageInstaller API demos.

Test: Ran "make docs".
Change-Id: I8459bc2a4aaf3827f71a6af5478ff0f30fae6dc3
diff --git a/core/java/android/content/pm/PackageInstaller.java b/core/java/android/content/pm/PackageInstaller.java
index 86288396..77c5743 100644
--- a/core/java/android/content/pm/PackageInstaller.java
+++ b/core/java/android/content/pm/PackageInstaller.java
@@ -81,6 +81,9 @@
  * <li>All APKs must have unique split names.
  * <li>All installations must contain a single base APK.
  * </ul>
+ * <p>
+ * The ApiDemos project contains examples of using this API:
+ * <code>ApiDemos/src/com/example/android/apis/content/InstallApk*.java</code>.
  */
 public class PackageInstaller {
     private static final String TAG = "PackageInstaller";