As DocuSign reportedly explores a sale to private equity, it’s acquiring a company itself.On Monday, DocuSign announced that it’s buying Lexion, a contract workflow automation startup, for $165 million. The purchase comes as DocuSign makes increasing investments in the contract management space, most recently launching DocuSign IAM, a service aimed at connecting different components of the corporate agreement creation and negotiation process.Lexion was incubated at the Allen Institute for Artificial Intelli ...