fix stepfunction map

[KillDozerX2]

Overview

• Description: Some definitions were incorrect
• Schema update type: [modification, extend]
• Services affected: Step Functions

References

• https://docs.aws.amazon.com/step-functions/latest/dg/input-output-itemreader.html
• https://states-language.net/#map-input-output-batching-items

[KillDozerX2]

@akshaydk Would love to see your feedback on this.