Update CHANGELOG.md

Co-authored-by: Henry Mercer <henrymercer@github.com>

Author: aeisenberg

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## [UNRELEASED]
 
-- Better error messages when the code scanning configuration file includes an invalid `queries` block or an invalid `query-filters` block. [#1208](https://github.com/github/codeql-action/pull/1208)
+- Improve error messages when the code scanning configuration file includes an invalid `queries` block or an invalid `query-filters` block. [#1208](https://github.com/github/codeql-action/pull/1208)
 
 ## 2.1.20 - 22 Aug 2022