[tor-bugs] #20829 [Core Tor/Tor]: Document state format for prop271 guards

[Tor Bug Tracker & Wiki]

#20829: Document state format for prop271 guards
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     Reporter:  nickm         |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #19877
       Points:                |   Reviewer:
      Sponsor:                |
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20829>
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