Doc: Revert QtQuick1 -> QtDeclarative

The library name, header include paths, etc. were reverted back in
October 2012: https://codereview.qt-project.org/#change,35516

Change-Id: I9056e9338dfc547cb0a52b49998e5e3a98202d81
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>