Add to CHANGELOG.md change about Amazon Linux 2 Kernel 5.10

Author: francesco-giordano

CHANGELOG.md

@@ -15,6 +15,7 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 
 **CHANGES**
 - Disable deeper C-States in x86_64 official AMIs and AMIs created through `build-image` command, to guarantee high performance and low latency.
+- Change Amazon Linux 2 base images to use AMIs with Kernel 5.10.
 
 **BUG FIXES**
 - Fix the configuration parameter `DirectoryService/DomainAddr` conversion to `ldap_uri` SSSD property when it contains multiples domain addresses.