[Doc] Update 313.1 changelog: bugfix on AD passwd reset script

Author: gmarciani

CHANGELOG.md

@@ -19,6 +19,7 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 **BUG FIXES**
 - Fix a bug in the installation of ARM Performance Library that was causing the build image fail in isolated environments.
 - Upgrade amazon-efs-utils to version 2.3.1 (from v2.1.0) for non-Amazon Linux AMI's.
+- Fix a bug that was preventing the script 'update_directory_service_password.sh' from updating the AD password due to lack of permissions.
 
 3.13.0
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