[tor-bugs] #17157 [Wiki]: Add a wiki entry for fallback directories

[Tor Bug Tracker & Wiki]

#17157: Add a wiki entry for fallback directories
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     Reporter:  teor    |      Owner:  teor
         Type:  defect  |     Status:  new
     Priority:  normal  |  Milestone:
    Component:  Wiki    |    Version:
   Resolution:          |   Keywords:
Actual Points:          |  Parent ID:  #15775
       Points:          |    Sponsor:  SponsorU
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Comment (by teor):

 Updated for the actual behaviour in #15775, and for the intended behaviour
 in #4483, and the intended IPv6 implementation in #8374.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17157#comment:3>
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