2.11: Update changelog

Reword EFA workaround sentence.

Author: enrico-usai

CHANGELOG.md

@@ -11,7 +11,7 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 
 **BUG FIXES**
 - Lock the version of ``nvidia-fabricmanager`` package to the installed NVIDIA drivers to prevent updates and misalignments.
-- Workaround EFA installer issue by uninstalling rdma-core before installing EFA on alinux2.
+- Fix EFA runtime installation on alinux2 when GPUDirect RDMA is enabled, by uninstalling ``rdma-core`` before installing EFA.
 
 2.11.1
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