Update changelog

Author: adamwathan

CHANGELOG.md

@@ -50,7 +50,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add arbitrary variants ([#8299](https://github.com/tailwindlabs/tailwindcss/pull/8299))
 - Add experimental `matchVariant` API ([#8310](https://github.com/tailwindlabs/tailwindcss/pull/8310), [34fd0fb8](https://github.com/tailwindlabs/tailwindcss/commit/34fd0fb82aa574cddc5c7aa3ad7d1af5e3735e5d))
 - Add `prefers-contrast` media query variants ([#8410](https://github.com/tailwindlabs/tailwindcss/pull/8410))
-- Experimental support for variant grouping ([#8405](https://github.com/tailwindlabs/tailwindcss/pull/8405))
 - Add opacity support when referencing colors with `theme` function ([#8416](https://github.com/tailwindlabs/tailwindcss/pull/8416))
 - Add `postcss-import` support to the CLI ([#8437](https://github.com/tailwindlabs/tailwindcss/pull/8437))