The guidance notes are all part of the same form now - there isn't a separate document. The doc you linked to is all you need (although the wording kinda suggests there is more, I agree).
Notice the contact details for further advice for the G~P to use if necessary.
Be aware that signing this form is not covered by the GP's NHS contract, so they are entitled to charge you for doing it if they want. Some do, some don't.
H