say what say what say what is new

dist/preview release/what's new.md

@@ -62,6 +62,7 @@
 - Refactored the shadow generators code ([Popov72](https://github.com/Popov72))
 - Supports clip planes with shadows ([sebavan](http://www.github.com/sebavan))
 - Added Workbench color scheme for VSCode ([drigax](https://github.com/drigax) & [Patrick Ryan](https://github.com/PatrickRyanMS))
+- Playground switch buttons are more intuitive ([#7601](https://github.com/BabylonJS/Babylon.js/issues/7601)) ([RaananW](https://github.com/RaananW/))
 
 ### Engine