[tor-bugs] #31838 [Core Tor/Tor]: Fix a typo in the practracker usage message

[Tor Bug Tracker & Wiki]

#31838: Fix a typo in the practracker usage message
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     Reporter:  teor          |      Owner:  teor
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.4.2.1-alpha
     Severity:  Normal        |   Keywords:  fast-fix
Actual Points:  0             |  Parent ID:
       Points:  0             |   Reviewer:
      Sponsor:                |
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 I don't think this needs a changes file?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31838>
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