[metrics-bugs] #21174 [Metrics/Metrics website]: tweak description below graphs (staging)

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#21174: tweak description below graphs (staging)
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     Reporter:  iwakeh                   |      Owner:  metrics-team
         Type:  enhancement              |     Status:  new
     Priority:  Medium                   |  Milestone:
    Component:  Metrics/Metrics website  |    Version:
     Severity:  Normal                   |   Keywords:
Actual Points:                           |  Parent ID:
       Points:                           |   Reviewer:
      Sponsor:                           |
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 It should be "This graph ..." instead of "The following graph ...".

 See tweak in [https://gitweb.torproject.org/user/iwakeh/metrics-
 web.git/commit/?h=staging2-1&id=0abf1ea2e43b94dc45c3a590c9668e6567f36622
 my branch] based on staging2.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21174>
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