(Bloomberg) — DocuSign Inc. tumbled 30% in extended trading Thursday after the e-signature company’s quarterly revenue forecast missed analysts’ estimates, stoking concerns about slowing growth after the Covid-19 pandemic fueled a surge in demand in 2020.Most Read from BloombergReliving the New York Subway Map Debate‘Ghost Signs’ Haunt London’s Reviving NeighborhoodsChina Cash Flowed Through Congo Bank to Former President’s CroniesAutomating the War on Noise Pollution‘Pension Poachers’ Are Targ