docs(changelog): renamed Label renderable to content

Author: TomJGooding

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 
 - Breaking change: The `renderable` property on the `Static` widget has been changed to `content`. https://github.com/Textualize/textual/pull/6041
+- Breaking change: Renamed `Label` constructor argument `renderable` to `content` for consistency https://github.com/Textualize/textual/pull/6045
 
 # [5.3.0] - 2025-08-07