[metrics-bugs] #33435 [Metrics/Onionperf]: Document BASETORRC environment variable

[Tor Bug Tracker & Wiki]

#33435: Document BASETORRC environment variable
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     Reporter:  acute              |      Owner:  metrics-team
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 OP can configure the Tor client through the BASETORRC environment
 variable. This should be added to the documentation with examples.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33435>
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