Updated "Open Source Version of Qt" page.
Updated "Open Source Version of Qt" page.

Replaced Nokia with Digia and updated the contact link.

Change-Id: Id95288057f18e9728ee775f1c842114f5bf9d472
Reviewed-by: Paul Olav Tvete <97541fb6312d77f06e19078c7c70b2c1f75fb828@digia.com>

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