docs: fix broken update scene button example in docs (#9726)

fix: update scene example in docs

dev-docs/src/theme/ReactLiveScope/index.js

@@ -33,6 +33,7 @@ const ExcalidrawScope = {
   initialData,
   useI18n: ExcalidrawComp.useI18n,
   convertToExcalidrawElements: ExcalidrawComp.convertToExcalidrawElements,
+  CaptureUpdateAction: ExcalidrawComp.CaptureUpdateAction,
 };
 
 export default ExcalidrawScope;