HDRP: update changelog

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

 - Refactored Constant Buffers to avoid hitting the maximum number of bound CBs in some cases.
 - Fixed the light range affecting the transform scale when changed.
 - Snap to grid now works for Decal projector resizing.
+- Added a warning for 128x128 cookie texture without mipmaps
 
 ### Changed
 - Movde Render Pipeline Debug "Windows from Windows->General-> Render Pipeline debug windows" to "Windows from Windows->Analysis-> Render Pipeline debug windows"