Doc: Update Qt Quick Controls description

Change-Id: Idd056eea674a96236656c452e7a1df5e8e20f0fd
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

doc/src/userinterfaces.qdoc

@@ -69,9 +69,7 @@ and shader effects.
 \section2 Graphical Controls
 
 The \l{Qt Quick Controls} module is new in Qt 5.1 and provides a
-set of UI elements to create classic desktop-style user interfaces using \l{Qt Quick} 2.
-While the module is not mature yet, it already offers useable featured controls
-styled for the desktop. See \l{Qt Quick Controls} for more information.
+set of UI elements to create user interfaces using \l{Qt Quick} 2.
 
 For more about how to create application user interfaces with QML, visit the
 \l{QML User Interfaces} page.