update changelog

Author: RobinMalfait

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Inherit gradient stop positions when using variants ([#11002](https://github.com/tailwindlabs/tailwindcss/pull/11002))
 - Honor default `to` position of gradient when using implicit transparent colors ([#11002](https://github.com/tailwindlabs/tailwindcss/pull/11002))
 - Ensure `@tailwindcss/oxide` doesn't leak in the stable engine ([#10988](https://github.com/tailwindlabs/tailwindcss/pull/10988))
+- Ensure multiple `theme(spacing[5])` calls with bracket notation in arbitrary properties work ([#11039](https://github.com/tailwindlabs/tailwindcss/pull/11039))
 
 ## [3.3.1] - 2023-03-30