Update migrate-prometheus-metrics-integrations.md

[huoyao1125]

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[gemini-code-assist]

Summary of Changes

Hello @huoyao1125, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request provides a minor but important update to the TiDB Cloud documentation, specifically correcting the deprecation date for legacy project-level Prometheus integrations. This ensures users have the most accurate information regarding the migration timeline for these services.

Highlights

• Documentation Update: The pull request updates the migrate-prometheus-metrics-integrations.md documentation file.
• Deprecation Date Correction: The deprecation date for legacy project-level Prometheus integrations has been updated from January 6, 2026, to January 9, 2026.

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[gemini-code-assist]

Code Review

This pull request updates the deprecation date for legacy project-level Prometheus integrations. The change in migrate-prometheus-metrics-integrations.md is correct. However, to ensure consistency across the documentation, please also update the same date in tidb-cloud/monitor-prometheus-and-grafana-integration.md, which still references the old date of January 6, 2026.