[Tails-dev] Please review'n'merge doc/update-persistence-pat…

Hi,

Hi, the path given here
https://tails.boum.org/doc/first_steps/persistence/configure/#index13h2
(/lib/live/mount/persistence/XXX_unlocked/live-additional-software.conf)
is incorrect.

I fixed it in branch doc/update-persistence-path.

(It's my first review'n'merge, I've looked what informations people
usually provide, but if I still miss something, please tell me.)

--
Vigdis