Apply suggestions from code review

Co-authored-by: Jirka Borovec <6035284+Borda@users.noreply.github.com>

Author: awaelchli

src/lightning/fabric/CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 
-## [2.3.0] - 2024-MM-DD
+## [unReleased] - 2024-MM-DD
 
 ### Added
 

src/lightning/pytorch/CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
-## [2.3.0] - 2024-MM-DD
+## [unReleased] - 2024-MM-DD
 
 ### Added