Revert "Revert "CDD: Relax Overview title count requirement.""

This reverts commit d1e913ce39953a030a9d7ed5c6ab85ba329fbb0b.

Change-Id: I36ba5bbbb49e91ab1338e517a9c86511c0e02574
diff --git a/3_software/3_8_user-interface-compatibility.md b/3_software/3_8_user-interface-compatibility.md
index f5f4c4b..89b4695 100644
--- a/3_software/3_8_user-interface-compatibility.md
+++ b/3_software/3_8_user-interface-compatibility.md
@@ -248,7 +248,7 @@
 following requirements:
 
 *   MUST support at least up to 20 displayed activities.
-*   MUST at least display the title of 4 activities at a time.
+*   SHOULD at least display the title of 4 activities at a time.
 *   MUST implement the [screen pinning behavior](http://developer.android.com/about/versions/android-5.0.html#ScreenPinning)
     and provide the user with a settings menu to toggle the feature.
 *   SHOULD display highlight color, icon, screen title in recents.