Update what's new.md

dist/preview release/what's new.md

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 - Added support for non-pow2 textures when in WebGL2 mode ([deltakosh](https://github.com/deltakosh))
 
 ## Updates
-- Normals are generated automatically if meshes do not have normals ([deltakosh](https://github.com/deltakosh))
+- Normals are generated automatically by StandardMaterial if meshes do not have normals ([deltakosh](https://github.com/deltakosh))
 
 ## Bug fixes
 - Fixed a bug with PBR on iOS ([sebavan](https://github.com/sebavan))