docs(vtkaxesactor): update BREAKING_CHANGES.md

BREAKING_CHANGES.md

@@ -4,6 +4,8 @@
 - **ResliceCursorWidget.invokeInternalInteractionEvent(methodName)**: has been removed and should be replaced by `ResliceCursorWidget.invokeInteractionEvent(methodName)`.
 - **ResliceCursorWidget.updateCameraPoints(renderer, viewType, resetFocalPoint, keepCenterFocalDistance, computeFocalPointOffset)** has lost the `keepCenterFocalDistance` parameter (because it was ALWAYS the negate of `computeFocalPointOffset`). The new signature is `ResliceCursorWidget.updateCameraPoints(renderer, viewType, resetFocalPoint, keepCenterFocalDistance, computeFocalPointOffset)`
 
+- **vtkAxesActor**: `setXAxisColor`, `setYAxisColor`, `setZAxisColor` now take a single `RGBColor` (array of 3 numbers) instead of 3 numbers for each color component. The `get*AxisColor` methods now return an array of 3 numbers instead of an object with `r`, `g`, `b` properties.
+
 ## From 28.x to 29
 
 - **getOpenGLRenderWindow**: `getOpenGLRenderWindow` has been renamed to `getApiSpecificRenderWindow` in `vtkFullScreenRenderWindow`, `vtkGenericRenderWindow` and `vtkViewProxy` to support WebGL and WebGPU backend. ([#2816](https://github.com/Kitware/vtk-js/pull/2816))
@@ -83,9 +85,9 @@ SplineWidget's handles now scale up automatically.
 
 ## From 19.x to 20
 
-In ShapeWidget: 
-- `setLabelTextCallback` is replaced by `text` substate.  
-- `setPixelScale` has been removed. It should be replaced by point handle `scale1` mixin and `scaleInPixels`.  
+In ShapeWidget:
+- `setLabelTextCallback` is replaced by `text` substate.
+- `setPixelScale` has been removed. It should be replaced by point handle `scale1` mixin and `scaleInPixels`.
 - `useHandles` has been removed. It should be replaced by `setHandleVisibility`.
 - `resetAfterPointPlacement` is now false by default.