Update documentation to reflect new Linux platform support

Fixes a few qdoc errors along the way.

Change-Id: Ia0caf483f5c86dbd5c47f3d96a6d5bcf622db312
Reviewed-by: Martin Leutelt <martin.leutelt@basyskom.com>
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>