[tor-bugs] #23778 [Metrics/Onionoo]: Add Onionoo's build revision to documents

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#23778: Add Onionoo's build revision to documents
---------------------------------+---------------------------
     Reporter:  iwakeh           |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:  Onionoo-1.6.0
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
---------------------------------+---------------------------
 Documents will contain a build_revision field, if a revision could be
 determined, e.g.,
 {{{
 {"version":"4.1","build_revision":"abcdfe7","relays_published":"2017 ...
 }}}

 Cf. #21414 for the discussion and the changes already available in
 [https://gitweb.torproject.org/metrics-
 base.git/commit/?id=78e533fdc84e20769a8a155d1426cbea59c6e7cc metrics-
 base].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23778>
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