update release notes

com.unity.render-pipelines.high-definition/CHANGELOG.md

 
 ## [Unreleased]
 
+### Fixed
+- Fixed a shader preprocessor issue when compiling DebugViewMaterialGBuffer.shader against Metal target
+- Added a temporary workaround to Lit.hlsl to avoid broken lighting code with Metal/AMD
+
 ### Added
 - Add option supportDitheringCrossFade on HDRP Asset to allow to remove shader variant during player build if needed
 - Add contact shadows for punctual lights (in additional shadow settings), only one light is allowed to cast contact shadows at the same time and so at each frame a dominant light is choosed among all light with contact shadows enabled.