Apply suggestion from @SkafteNicki

Author: SkafteNicki

src/lightning/fabric/CHANGELOG.md

@@ -27,7 +27,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
-- Learning rate scheduler is stepped at the end of epoch when `on_train_batch_start` returns -1 ([[#21296](https://github.com/Lightning-AI/pytorch-lightning/issues/21296)]).
+- Learning rate scheduler is stepped at the end of epoch when `on_train_batch_start` returns -1 ([#21296](https://github.com/Lightning-AI/pytorch-lightning/issues/21296)).
 
 
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