Amazon EC2 Container Service Update: Minor updates to exceptions for completeness

Author: AWS

.changes/next-release/feature-AmazonEC2ContainerService-2b438d3.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Amazon EC2 Container Service",
+    "contributor": "",
+    "description": "Minor updates to exceptions for completeness"
+}