formatting and spelling fixes for extend doc (#270)
formatting and spelling fixes for extend doc (#270)


rfay/ddev,beeradb/ddev,rfay/ddev,drud/ddev,rfay/ddev,rfay/ddev,drud/ddev,beeradb/ddev,cyberswat/ddev,cyberswat/ddev,rfay/ddev,drud/ddev,drud/ddev,drud/ddev