Document "About" to know which version of Tails is running
When we broke upgrade in 4.14, some users didn't know how to check whether their Tails USB stick was already up-to-date.
We should have #16796 (closed), but until then we could document Applications → Tails → About Tails.
I'm not sure what's best between:
- FAQ
- /doc/upgrade, adding a tip in the intro that would mention Applications → Tails → About Tails and the latest version.
- /doc/first_steps/introduction_to_gnome_and_the_tails_desktop
Maybe a mix of /doc/upgrade and /doc/first_steps/introduction_to_gnome_and_the_tails_desktop to avoid overloading the FAQ?
The resulting page should be searchable with something like https://duckduckgo.com/?q=How+do+I+check+what+version+of+tails+I'm+running%3F.