tor-spec: clean-ups and a new proposal (357) related to use of KH.

Nick Mathewsonrequested to merge
nickm/torspec:kh_clarification into main

In this branch:

  • We clean up some of our usage of CREATE, to make sure that "CREATE" never means "CREATE or CREATE2".
  • We clarify some points about the generation and use of the KH field.
  • We add a new proposal for a better way to use KH in the future.

Closes #191 (closed).

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