Strictly speaking the kebab is just the meat and it's similar to Greek gyros. In this case they are referring to the whole döner sandwich which includes pita bread and vegetables. It's a popular German fast food item with Turkish roots.
not typically, I still remember that Syrian lady that gave me puzzled looks for wanting fries as well as toum and tahini in my shawarma.
As far as I know Levantine/Arab Shawarma, Turkish Doner Kebab and Greek Gyro are similar in appearance and concept but still different in which meats and toppings are used and how they are prepared and served.