Add alternative data seed for different level of dropdown.

Signed-off-by: Hendra Uzia <hendra.uzia@yahoo.co.id>
Add example for multiple set of dropdown in a single form.

Signed-off-by: Hendra Uzia <hendra.uzia@yahoo.co.id>
Change all pre tag to be scrollable.

Signed-off-by: Hendra Uzia <hendra.uzia@yahoo.co.id>
Add alternate data seed to example documentation.

Signed-off-by: Hendra Uzia <hendra.uzia@yahoo.co.id>