Add documentation for QSGImage
Add documentation for QSGImage

Change-Id: I1cfae5fb57025372789391632bac4cb97b8450dc
Reviewed-on: http://codereview.qt.nokia.com/1684
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Yann Bodson <5e9a2ede9718ced53adc2874c6f2fe014ac177cd@nokia.com>

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