[tor-bugs] #31078 [Core Tor/Tor]: improve docs for config var abstraction

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#31078: improve docs for config var abstraction
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 Reporter:  catalyst      |          Owner:  nickm
     Type:  defect        |         Status:  assigned
 Priority:  Medium        |      Milestone:  Tor: 0.4.2.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:  #29211        |         Points:  2
 Reviewer:                |        Sponsor:  Sponsor31-can
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Changes (by teor):

 * owner:  (none) => nickm
 * status:  new => assigned
 * milestone:  Tor: unspecified => Tor: 0.4.2.x-final


Comment:

 These changes need to be done (or at least triaged) before we continue
 work on #29211.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31078#comment:3>
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