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dist/preview release/what's new.md

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 - Added support for glTF mesh instancing extension ([#7521](https://github.com/BabylonJS/Babylon.js/issues/7521)) ([drigax](https://github.com/Drigax))
 
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 ### Materials
 
 - Added the `roughness` and `albedoScaling` parameters to PBR sheen ([Popov72](https://github.com/Popov72))