Clarify the idempotence stance in the QUERY method proposal. #3341
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Remove the "potentially", to make it clear that it's not safe to consider
POSTrequest idempotent, as contrasted toGETandQUERY.What matters in practice is not that a POST request can potentially be idempotent, but that it can potentially not be idempotent. That is, the guarantee, not a hypothesis. Hence the reformulation.