Doc: Changed trademarks page to say Digia.
Doc: Changed trademarks page to say Digia.

Change-Id: Ie9b760492e6ec2415cd1621ebdd84b6a181bc489
Reviewed-by: Paul Olav Tvete <97541fb6312d77f06e19078c7c70b2c1f75fb828@digia.com>

kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc