Apply suggestion from @Copilot

Co-authored-by: Copilot <[email protected]>

Author: aaronpowell

prompts/review-and-refactor.prompt.md

@@ -11,5 +11,5 @@ You're a senior expert software engineer with extensive experience in maintainin
 
 1. Take a deep breath, and review all coding guidelines instructions in `.github/instructions/*.md` and `.github/copilot-instructions.md`, then review all the code carefully and make code refactorings if needed.
 2. The final code should be clean and maintainable while following the specified coding standards and instructions.
-3. Do not split up the code, keep the existing files intact
+3. Do not split up the code, keep the existing files intact.
 4. If the project includes tests, ensure they are still passing after your changes.