Update tor-spec for ed25519 link authentication keys
tor-spec.txt says that the ed25519 link authentication key isn't used:
These are Ed25519 keys: - A long-term "master identity" key. This key never changes; it is used only to sign the "signing" key below. It may be kept offline. - A medium-term "signing" key. This key is signed by the master identity key, and must be kept online. A new one should be generated periodically. - A short-term "link authentication" key. Not yet used.
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