"Tip: It’s possible to make an object rotate a full 360° in just one frame by using the rotate command and not changing the position of the object in a subsequent frame. However, the object will only rotate about its centre. This might have some uses in certain situations."

Would someone please show an example of the correct syntax for this?

1) New Animation File
2) Draw square on frame 1> select square> name> rotate+: square

2) preview animation = non rotating square.

rotate+: square
rotate+ 360: square
rotate+: 360 square