[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:  needs_review
 Priority:  Medium    |      Milestone:
Component:  Wiki      |        Version:
 Severity:  Normal    |     Resolution:
 Keywords:            |  Actual Points:
Parent ID:  #15775    |         Points:
  Sponsor:  SponsorU  |
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Changes (by teor):

 * severity:   => Normal


Comment:

 I've just updated the wiki entry for UseDefaultFallbackDirs in #17576,
 clarified the option behaviors, and updated the dates and IPv6 trial info.

 I think this is suitable, but someone needs to read over it before we send
 out the opt-in request email.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17157#comment:5>
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