[tor-bugs] #22861 [Core Tor/Tor]: Update tor-spec for ed25519 link authentication keys

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#22861: Update tor-spec for ed25519 link authentication keys
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.0.1-alpha
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:  0.2           |   Reviewer:
      Sponsor:                |
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 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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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22861>
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