Cancels the selection of this particular series. The series is displayed in its initial style.
A series point is a data object's visual representation. It can be selected, hovered over, or hidden. You can access the data object that the series point represents using the point's data field.
This method does not change the behavior if you hide the series. However, if you hide a series point with the hide() method, it will no longer be considered visible.
When a series is selected, this method returns true. Otherwise, the returned value is false.