Documentation: Clarify global variables.
Documentation: Clarify global variables.

Rubber-stamped-by: hjk

Change-Id: Ic5d8a50deeee93572d838725d1cf4d2af6245c0f
Reviewed-on: http://codereview.qt.nokia.com/510
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Friedemann Kleint <1b9f2592239daaec4856ccc1cfb4d2d55b35fb71@nokia.com>

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