[tbb-bugs] #32715 [Applications/Tor Browser]: Document our downloads.json file

[Tor Bug Tracker & Wiki]

#32715: Document our downloads.json file
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-spec
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 We have
 https://aus1.torproject.org/torbrowser/update_3/release/downloads.json
 (and a similar URL for alpha (s/release/alpha)) for users/devs that want
 to keep a reliable way for grabbing the latest updates or pull the latest
 version information so that they can see when new updates are available.

 The JSON file got specifically created to be easily parsable in #16651.
 This seems to work pretty well from all we know but we never documented
 that feature nor specified it.

 We think this should finally be mentioned on our dev portal and we should
 write kind of a retroactive proposal and put it into our proposal folder
 in `tor-browser-spec` so that we have something official we can link to.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32715>
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