Document that physically removing the USB stick to stop Tails might damage the persistent volume
People reported having problems (bad superblock) using the persistent volume after pulling out the USB stick to shutdown Tails.
This technique works, but shall we document that it is recommended to rather shutdown properly, as pulling out might leave the filesystem on the USB stick in a transitional state?
That would go as a caution on this page: https://tails.boum.org/doc/first_steps/shutdown/
Feature Branch: doc/7747-persistent-volume-damage
- Related to #7588