Why DocuSign could be poised to rally.DocuSign (DOCU 2.13%) shares continue to tread water despite the electronic signature-solutions provider recently reporting better-than-expected second-quarter results. The stock is down about 5% year to date.Let's dive into the company's most recent quarterly results to see if this is a buying opportunity.Solid revenue growth, but bookings guidance disappointsFor it fiscal second quarter, DocuSign's revenue jumped 7% year over year to $736 million. Subscription revenue ...