Updated release notes

com.unity.render-pipelines.lightweight/CHANGELOG.md

 - pipeline now uses XRSEttings.eyeTextureResolutionScale as renderScale when in XR 
 
 ### Changed
+- Reduced by 25% frame time in Mali Utgard arch in Overdraw benchmark scene by removing indexing in shadow code and avoiding division for orthographic projection.
 - Screenspace shadow resolve is not only done when rendering shadow cascades
 
 ### Fixed