Document assistant tier management

[mintlify]

Added documentation for the new assistant tier management feature that allows users to upgrade or downgrade their message allowance tiers. The new section explains how tiers work, how to change them through the dashboard, and the behavior differences between upgrades and downgrades.

Files changed

• ai/assistant.mdx - Added "Change your assistant tier" section with instructions for viewing and changing tiers, plus upgrade/downgrade behavior details

Generated from Allow for updating assistant tier @k-finken

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Note

Introduces documentation for managing assistant tiers and clarifies billing-related settings.

• Adds a new "Change your assistant tier" section with steps to switch tiers via the Billing tab
• Documents upgrade vs. downgrade behavior (immediate allowance changes and prorated charges; no carryover on downgrade)
• Reorganizes billing content by moving and tightening the "Set a spend limit" section with clearer steps

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