[tor-bugs] #18649 [Tor]: Clarify comments around closing excess consensus connections

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#18649: Clarify comments around closing excess consensus connections
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     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.8.x-final
    Component:  Tor     |    Version:  Tor: 0.2.8.1-alpha
     Severity:  Normal  |   Keywords:  comment-only must-fix-before-028-rc
Actual Points:          |  Parent ID:
       Points:          |   Reviewer:
      Sponsor:          |
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 arma made a comment in #18625 about the functions that close excess
 consensus connections being unclear.

 I've added comments to make it clearer what "excess" means, and why we
 won't ever close our only consensus connection attempt.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18649>
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