Proposed changes

I replaced a truncated cryptographic fingerprint with the full fingerprint. My rationale:

1. As you're providing the apt command for easy copy & paste, there's no good ease-of-use argument for using just part of the fingerprint.
2. It promotes poor security hygiene.
3. Verifying eight hexits just isn't useful. It's hard to imagine an attacker in a position to provide a different key while not also being in a position to just generate a few billion keys hoping for that much of a hash collision.