[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:
 Keywords:  SponsorU  |  Actual Points:
Parent ID:  #15775    |         Points:
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17157>
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