Point to the porting guide, so that users who search for the old names
will be directed to an explanation of the name change.

Also made some new links to Qt Quick 2, and changed "favour" -> "favor"
(Sanity Bot complained)

Change-Id: If30c8d619d8fdb9df72b7b5f3efd356f1e07b23a
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>