Update assistant credit package language

[ethanpalm]

Documentation changes

Brief description of what's being updated

Closes

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
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• Nothing important is missing
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✅ User experience

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Note

Low Risk
Documentation-only wording updates that don’t affect product behavior; risk is limited to potential user confusion if terminology mismatches the UI.

Overview
Updates assistant/configure.mdx billing docs to consistently describe assistant usage in terms of credits (credit packages, credit allowance, carryover, overages, and alerts) instead of messages.

Clarifies package management instructions by referencing only the Credit packages section and updating upgrade/downgrade bullets to use credit-based terminology.

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