Doc: Updated Layout examples.

-added links to and from the overviews.
-added information on how to run the example.
-updated copyright.

Task-number: QTBUG-33597
Change-Id: Ib049cb94f136caa6916878959ae830248bd236b5
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Nico Vertriest <nico.vertriest@digia.com>