[Docs] Fixes to changelog 3.9.3: cloud_dns.

Signed-off-by: Giacomo Marciani <mgiacomo@amazon.com>

Author: gmarciani

CHANGELOG.md

@@ -43,6 +43,10 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 **ENHANCEMENTS**
 - Add support for FSx Lustre as a shared storage type in us-iso-east-1.
 
+**BUG FIXES**
+- Remove `cloud_dns` from the `SlurmctldParameters` in the Slurm config to avoid Slurm fanout issues.  
+  This is also not required since we set the IP addresses on instance launch.
+
 3.9.2
 ------