minor rewording
minor rewording

avigad/logic_and_proof,rlewis1988/logic_and_proof,leanprover/logic_and_proof,avigad/logic_and_proof,leanprover/logic_and_proof,rlewis1988/logic_and_proof,leanprover/logic_and_proof,avigad/logic_and_proof,rlewis1988/logic_and_proof