Update CHANGELOG.md

Co-authored-by: Christoph Knittel <[email protected]>

Author: DZakh

CHANGELOG.md

@@ -29,7 +29,7 @@
 - A little performance improvement for JSX V4 runtime helper by removing one object allocation for components with key prop. https://github.com/rescript-lang/rescript-compiler/pull/6376
 - The error message for "toplevel expressions should evaluate to unit" has been revamped and improved. https://github.com/rescript-lang/rescript-compiler/pull/6407
 - Display the compile time for `rescript build` command. https://github.com/rescript-lang/rescript-compiler/pull/6404
-- Actualize help message for `build` and `clean` commands. https://github.com/rescript-lang/rescript-compiler/pull/6404
+- Improve help message for `build` and `clean` commands. https://github.com/rescript-lang/rescript-compiler/pull/6404
 - Pass through the `-verbose` flag to builds in watch mode. https://github.com/rescript-lang/rescript-compiler/pull/6404
 
 # 11.0.0-rc.3