Use new looping construct in examples

demo/real.dee

@@ -1,11 +1,10 @@
 ## Obligatory
 fizzbuzz <- ->
-  loop(range(100), x ->
+  loop over x in range(100)
     if x % 15 = 0 print("fizzbuzz")
     elif x % 3 = 0 print("fizz")
     elif x % 5 = 0 print("buzz")
     else print(x)
-  )
 
 fizzbuzz()