Update CHANGELOG.md

Align it to the cli.

Author: enrico-usai

CHANGELOG.md

@@ -7,7 +7,7 @@ This file is used to list changes made in each version of the aws-parallelcluste
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 **BUG FIXES**
-- Slurm: fix issue that was causing powering up nodes to not be correctly reset after a stop and start of the cluster. 
+- Slurm: fix issue that prevented powering-up nodes to be correctly reset after a stop and start of the cluster.
 
 2.11.1
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