[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

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

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✨ Finishing touches

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