say what say waht say what is new (what is new!)

dist/preview release/what's new.md

@@ -172,6 +172,7 @@
 - Optional camera gaze mode added to the pointer selection feature ([RaananW](https://github.com/RaananW))
 - Exposing feature points when running on top of BabylonNative ([Alex-MSFT](https://github.com/Alex-MSFT))
 - WebXR hit test can now define different entity type for the results ([#8687](https://github.com/BabylonJS/Babylon.js/issues/8687)) ([RaananW](https://github.com/RaananW))
+- Expose the overlay to which the XR Enter/Exit buttons are added to ([#8754](https://github.com/BabylonJS/Babylon.js/issues/8754)) ([RaananW](https://github.com/RaananW))
 
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