Fix documented QMetaType::UserType value.

QMetaType::UserType was changed from 256 to 1024, this was not reflected
in the code parsed by qdoc.

Change-Id: I0a02e8b020d495fbf2508d84b690adae1b677125
Reviewed-by: Laszlo Papp <lpapp@kde.org>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@nokia.com>

src/corelib/kernel/qmetatype.h

@@ -241,7 +241,7 @@ public:
         QMatrix = 79, QTransform = 80, QMatrix4x4 = 81, QVector2D = 82,
         QVector3D = 83, QVector4D = 84, QQuaternion = 85, QPolygonF = 86,
         QSizePolicy = 121,
-        User = 256
+        User = 1024
     };
 #endif