Correctly ternminate the sentence with a period.

Author: hehe7318

CHANGELOG.md

@@ -16,7 +16,7 @@ CHANGELOG
 **BUG FIXES**
 - Fix a bug which may cause `update-cluster` and `update-compute-fleet` to fail when compute resources reference an expired Capacity Reservation
   that is no longer accessible via EC2 APIs.
-- Fix `build-image` failure on Rocky 9, occurring when the parent image does not ship the latest kernel version
+- Fix `build-image` failure on Rocky 9, occurring when the parent image does not ship the latest kernel version.
   See https://github.com/aws/aws-parallelcluster/issues/6874.
 
 3.13.1