[V2] Update new-change script enhancement description. (aws#9607)

Author: github-actions[bot]

scripts/new-change

@@ -56,7 +56,8 @@ TEMPLATE = """\
 # feature: A larger feature or change in behavior, usually resulting in a
 #          minor version bump.
 # bugfix: Fixing a bug in an existing code path.
-# enhancement: Small change to an underlying implementation detail.
+# enhancement: An incremental improvement or a change to an underlying 
+           implementation detail.
 # api-change: Changes to a modeled API.
 type: {change_type}