remove mention of file: URIs for package installs

they're not supported

Change-Id: Id274ee6065ba531c01ad720ac0a53fb97e0fc687
Fixes: 6517618

core/java/android/content/Intent.java

@@ -1448,7 +1448,7 @@ public class Intent implements Parcelable, Cloneable {
     /**
      * Activity Action: Launch application installer.
      * <p>
-     * Input: The data must be a content: or file: URI at which the application
+     * Input: The data must be a content: URI at which the application
      * can be retrieved.  As of {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1},
      * you can also use "package:<package-name>" to install an application for the
      * current user that is already installed for another user. You can optionally supply