docs(batch): snippet typo on batch processed messages iteration

[j2clerck]

Issue #, if available:

Description of changes:

This is a small change to the documentation, fixing an extra iteration over processed_messages in batch processor.

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• [X PR title follows conventional commit semantics

Breaking change checklist

RFC issue #:

• Migration process documented
• Implement warnings (if it can live side by side)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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View rendered docs/utilities/batch.md

[codecov-commenter]

Codecov Report

Merging #951 (0d2498e) into develop (a1ee4e9) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #951      +/-   ##
===========================================
- Coverage    99.96%   99.96%   -0.01%     
===========================================
  Files          119      119              
  Lines         5322     5320       -2     
  Branches       614      613       -1     
===========================================
- Hits          5320     5318       -2     
  Partials         2        2              

Impacted Files	Coverage Δ
...ities/data_classes/api_gateway_authorizer_event.py	100.00% <0.00%> (ø)

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[heitorlessa]

Thanks a lot again @j2clerck ;)

[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!