add subheadings for consistency

markdown/dev/reference/api/point/clone/en.md

@@ -4,6 +4,8 @@ title: Point.clone()
 
 Returns a new `Point` with the same coordinates and attributes as the original point.
 
+## Point.clone() signature
+
 ```js
 Point point.clone()
 ```
@@ -17,6 +19,8 @@ The [`Point.copy()`](reference/api/point/copy/) method will only copy the point'
 
 </Note>
 
+## Point.clone() example
+
 <Example
   part="point_clone"
   caption="An example of the Point.clone() method"