[tor-bugs] #11674 [Tor]: Document TOR_PT_PROXY in 'pt-spec.txt'.

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#11674: Document TOR_PT_PROXY in 'pt-spec.txt'.
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 Reporter:  asn              |          Owner:
     Type:  defect           |         Status:  new
 Priority:  normal           |      Milestone:
Component:  Tor              |        Version:
 Keywords:  tor-spec tor-pt  |  Actual Points:
Parent ID:  #8402            |         Points:
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 #8403 was great, but since we decided to implement the PT-outgoing-proxy
 feature we should also mention how it works in `pt-spec.txt` (since that's
 where people who want to develop PTs look at)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11674>
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