wish: clarify how to get the bakery binary into /mnt/stateful/lxd_conf

[markstos]

This type of command work from inside the termina VM: (Not the penguin container)

curl -L https://github.com/nicholasjackson/bakery/releases/download/v0.1.2/bakery_0.1.2_Linux_amd64.tar.gz | tar -C /mnt/stateful/lxd_conf -xvz  bakery

[markstos]

More feedback on the docs. This command resulted in an error for me when the Termina was shut down:

  Start a new session vsh termina

Instead, from Crosh I used vmc start termina and that dropped into a chronos@localhost shell instead in the Termina VM.