Update fiber.md

docs/fiber.md

@@ -48,15 +48,15 @@ var closure = {
 
 var fiber = Fiber.create(closure)
 
-fiber.call()
-// prints 0
-
 fiber.call()
 // prints 1
 
 fiber.call()
 // prints 2
 
+fiber.call()
+// prints 3
+
 fiber.call()
 // prints Done
 
@@ -91,4 +91,4 @@ while (!fiber.isDone()) {
   fiber.call()
 }
 
-```
+```