Update CHANGELOG.md

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: johlju

CHANGELOG.md

@@ -14,7 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Added setup workflow for GitHub Copilot.
   - Switch the workflow to use Linux.
-  - Attempt to un-shallow the Copilot branch
+  - Attempt to unshallow the Copilot branch
 - `Assert-SqlDscLogin`
   - Added new public command to validate that a specified SQL Server principal
     exists as a login, throwing a terminating error if it doesn't exist.