Doc: Updated "Qt Quick Examples" pages.

-added instructions about running the example (using \include)
-used the example names as sections in the collection pages
-general editing and documentation polishing
-updated copyright information

Change-Id: I044f29fcc1921a541040505d5821acb06dc4cb35
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Doc: Removed redundant link to section in the same page.

There is no need to refer to a different section as it is understood
that those instructions apply to all examples.

Change-Id: I2d0d2d6cbf84790bc4ca2f3deda57ab5d3d1c6c1
Reviewed-by: Martin Smith <martin.smith@digia.com>