Based on the wiki page. Fixed links to point to 5.9.

Change-Id: I27b67aa487400a9b370911e43676f695d01391b5
Reviewed-by: Martin Smith <martin.smith@qt.io>
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>