Fix Batching Documentation code

[Abrax20]

Summary

Fix wrong code example in Batching Documentation.

Motivation

I try to use the Batching Request example and i did not find the batchResponse variable in the code.

Closing issues

Fixes #
Change variable name to the right one.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [] New feature (non-breaking change which adds functionality)
• [] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING document.
• [o] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• [o] I have added tests to cover my changes.
• [o] All new and existing tests passed.