add subheadings for consistency

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

@@ -4,6 +4,8 @@ title: Point.copy()
 A point's `copy()` method returns a new point with the same coordinates as the original point.
 This method does _not_ copy any attributes the original point may have.
 
+## Point.copy() signature
+
 ```js
 Point point.copy()
 ```
@@ -17,6 +19,8 @@ To also copy the attributes, use [`Point.clone()`](reference/api/point/clone/) i
 
 </Note>
 
+## Point.copy() example
+
 <Example
   part="point_copy"
   caption="An example of the Point.copy() method"