feat(27): add more text, fix typos
feat(27): add more text, fix typos

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