Make it clear that Visual Studio is not required for Qt dev on Windows.
Make it clear that Visual Studio is not required for Qt dev on Windows.

Change-Id: I79ff814828578566f2259a5c6dfc377876c5fab3
Reviewed-by: Paul Olav Tvete <97541fb6312d77f06e19078c7c70b2c1f75fb828@digia.com>
Reviewed-by: Friedemann Kleint <1b9f2592239daaec4856ccc1cfb4d2d55b35fb71@digia.com>

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