Doc: keyboard shortcuts to turn text into lowercase or uppercase
Doc: keyboard shortcuts to turn text into lowercase or uppercase

Task-number: QTCREATORBUG-563
Change-Id: Id91833f068aa56100d2fc2dc95906ef4d08e781d
Reviewed-on: http://codereview.qt.nokia.com/103
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Thorbjørn Lindeijer <655f5452590a8051e52f7bcb2cf0c775dee83bbf@nokia.com>

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