doc: Fix Graphics View example docs

doc: Fix Graphics View example docs

Make the same layout of the new graphics view example documentation
as we had before (except by using annotatedlist instead of hardcoding
the links). I've also moved four examples from qtdoc to qtbase so
that they can be included in this documentation.

Change-Id: Ic2202ade119cadd98d036f1bd77e91dae49b5677
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>