Update .github/copilot-instructions.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: mbaluda

.github/copilot-instructions.md

@@ -15,6 +15,6 @@ For PRs that add new queries or modify existing queries, also consider the follo
 - Are the alert messages properly formatted and consistent with the style guide?
 - Does the query have an appropriate level of in-query comments/documentation?
 - Does the query not reinvent features in the standard library?
-- Can the query be simplified further (not golfed!)
+- Can the query be simplified further (not golfed!).
 
 In your review output, list only those checklist items that are not satisfied or are uncertain, but also report any other problems you find outside this checklist; do not mention checklist items that clearly pass.