[tbb-bugs] #29980 [Applications/Tor Browser]: Add android-x86 target to README files

[Tor Bug Tracker & Wiki]

#29980: Add android-x86 target to README files
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     Reporter:  gk                   |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm, tbb-mobile,
     Severity:  Normal               |  GeorgKoppen201904
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
-------------------------------------+-------------------------------------
 In #27210 we added support for Android x86 devices but forgot about
 adapting the `tor-browser-build` README files.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29980>
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