Upgrade screenshot of Tails in virtual machine

Let’s wait until sajolida or spriver has a pure Debian with some virtualization to upgrade: https://tails.boum.org/doc/advanced_topics/virtualization/tails-in-jessie.png.

But it shouldn’t block 3.0.

Feature Branch: spriver:doc/12366-upgrade-screenshot-of-tails-in-vm

Original created by @sajolida on 12366 (Redmine)

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