Fix the link to the newly published Qbs Manual in
qt-project.org/doc/qbs/. Describe how to use the
Qbs project wizards. Update screenshot to show a
project generated by the wizard.
Change-Id: I5fa7ce03499a4fdcdfdeea676a933ded64200598
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>