doc: update the Tutorial for the current version of the API.
doc: update the Tutorial for the current version of the API.

It was kind of stale.

rpm-software-management/libhif,rpm-software-management/libdnf,edynox/libdnf,Conan-Kudo/libhif,rpm-software-management/libdnf,cgwalters/libhif,edynox/libdnf,hughsie/libhif,hughsie/libhif,cgwalters/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,edynox/libdnf,Conan-Kudo/libhif,Conan-Kudo/libhif,cgwalters/libhif,edynox/libdnf,hughsie/libhif,cgwalters/libhif,hughsie/libhif,Conan-Kudo/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,rpm-software-management/libhif