It means they don't care about layout etc when looking at your application...
Ah but where do I put the covering letter? Do I just stick it in the same box above the CV?
I guess thats where its going to end up. Unless there is somewhere else to put it.
If you dont know the answer to that should you really be applying to apple?
Ensure you can provide a contact phone number. After you write your cover letter, state that a pdf of your CV is available upon request, contact email. Then paste in your CV in plain text.