[EDU-2109] Clarify batched webhook rate and behavior

[m-hulbert]

Description

This PR clarifies the behavior of webhook batching, including the rate at which messages are batched.

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing Touches

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