[Tails-dev] Review and merge doc/7259-seahorse-nautilus-scre…

Branch: doc/7259-seahorse-nautilus-screenshots into master
Ticket: https://labs.riseup.net/code/issues/7259

When I do small changes like this I tend to flag them for the next
release, so we don't loose them from sight too much. But I understand
that this is not directly related to 1.2, so please me if I should do
things differently.

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sajolida