[tbb-bugs] #28467 [Applications/Tor Browser]: Update README.HACKING for adding part about working with submodules and binary patches

[Tor Bug Tracker & Wiki]

#28467: Update README.HACKING for adding part about working with submodules and
binary patches
-------------------------------------+-------------------------------------
     Reporter:  gk                   |      Owner:  tbb-team
         Type:  enhancement          |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm,
     Severity:  Normal               |  TorBrowserTeam201811,
                                     |  GeorgKoppen201811
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
-------------------------------------+-------------------------------------
 We started using submodules (in #25013) and it may need some different
 treatment if patching components, which we should document in our HACKING
 document

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28467>
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