Make it clear that QtOpenGL is a compat module
Make it clear that QtOpenGL is a compat module

Change-Id: Id8e2e6aa8c003ab7abe07f1f4f7a71b189dc7a7d
Reviewed-by: Paul Olav Tvete <97541fb6312d77f06e19078c7c70b2c1f75fb828@digia.com>

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