Fix typo in QQuickText documentation.

Change-Id: Ic2e96e881fe13bcac11e7c172963e2c1e9928256
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
nest quickwidgets into the opengl conditional

the qtHaveModule(quick) could have of course not worked at this point.

Task-number: QTBUG-38202
Change-Id: Id0270d445b9b82731209d69a9dc1950c03c26781
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>