Update changelog to have correct next version.

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

 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [unreleased]
-- Update assembly definitions to output assemblies that match Unity naming convention (Unity.*).
-
+
+### Changed
+- Update assembly definitions to output assemblies that match Unity naming convention (Unity.*).
 
 ## [2.0.5-preview]
 

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

 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [3.0.0-preview]
 ### Added
 - Added camera additional data component to control shadows, depth and color texture.
 - pipeline now uses XRSEttings.eyeTextureResolutionScale as renderScale when in XR.