[Tails-ux] documentation installation guide MAC

Hi,

>>
>> Spencer:
>> I think it is necessary to explain the difference
>> between /dev/disk# and /dev/rdisk#
>>
>
> sajolida:
> We already have [clear instructions]
>
> What would you change?
>

Adding an explanation would aid in the trust and understanding areas, as
"What does /r even mean?", a question many ask themselves, requires
further inquiry and therefore breaks the Tails curated experience or
goes unresolved.

Feel free to ignore this (:

Wordlife,
Spencer