Remove stale per-key monthly limit from assistant API docs

[mintlify]

Summary

The assistant API rate limit docs listed a "10,000 uses per key per month" limit that no longer applies to newly minted discovery keys. The effective limits enforced by Mintlify (10,000 requests per organization per hour and 10,000 requests per IP per day) remain unchanged and are still documented.

Changes

Removed the "10,000 uses per key per month" line from the rate limits section of:

• api/assistant/create-assistant-message.mdx
• api/assistant/create-assistant-message-v2.mdx
• Translated copies in es/, fr/, and zh/

Context

Source PR removed duplicate per-key rate limits that were tripping customers before the documented org/IP limits had a chance to run. The docs are updated to match the new behavior.

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Note

Low Risk
Low risk: documentation-only changes that delete an obsolete rate limit line and lightly adjust formatting in translated pages.

Overview
Updates the Assistant API Rate limits sections to remove the stale “10,000 uses per key per month” limit from both v1 and v2 “create assistant message” docs.

Applies the same cleanup to the Spanish, French, and Chinese translated pages (with minor French punctuation/list formatting adjustments), leaving only the org/hour and IP/day limits documented.

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