Update CHANGELOG.md

Author: adamwathan

CHANGELOG.md

@@ -12,7 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Allow default ring color to be a function ([#7587](https://github.com/tailwindlabs/tailwindcss/pull/7587))
 - Preserve source maps for generated CSS ([#7588](https://github.com/tailwindlabs/tailwindcss/pull/7588))
 - Split box shadows on top-level commas only ([#7479](https://github.com/tailwindlabs/tailwindcss/pull/7479))
-- Use local user css cache for `@apply` ([#7524](https://github.com/tailwindlabs/tailwindcss/pull/7524))
+- Use local user CSS cache for `@apply` ([#7524](https://github.com/tailwindlabs/tailwindcss/pull/7524))
 
 ### Changed
 
@@ -31,7 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
-- Temporarily move postcss to dependencies ([#7424](https://github.com/tailwindlabs/tailwindcss/pull/7424))
+- Temporarily move `postcss` to dependencies ([#7424](https://github.com/tailwindlabs/tailwindcss/pull/7424))
 
 ## [3.0.21] - 2022-02-10