Document threading issues with QSGEngine signals
Document threading issues with QSGEngine signals

Change-Id: I769c0793929c4c90464f6e9fea46bd1a19fbacf3
Reviewed-on: http://codereview.qt.nokia.com/939
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Gunnar Sletta <d0b71651f3efaa9fda200bbcc395b7b82a871fdd@nokia.com>

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