Short answer – you can’t, just because there is nowhere in EA or eaDocX to say what the order should be. This is because the order in which EA saves the elements of a diagram is just the order in which you created them, which is usually meaningless.
Just to make it predictable, eaDocX prints the elements in the order of the their element types, so ‘Decisions’ come after ‘Changes’ but before ‘Requirements’.
If you can suggest somewhere where you can specify the order, I am open to ideas!