sync-diff-inspector: add PROCESS permission when upstream and downstream are TiDB (#22289)

[ti-chi-bot]

This is an automated cherry-pick of #22289

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• This PR is translated from:sync-diff-inspector: add PROCESS permission when upstream and downstream are TiDB docs-cn#21253
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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, 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 enhances the sync-diff-inspector documentation by explicitly detailing a crucial permission requirement. It clarifies that the PROCESS privilege is essential for scenarios where both the source and target databases are TiDB clusters, facilitating the tool's ability to access vital cluster metadata.

Highlights

• New Permission Requirement: Documentation for sync-diff-inspector now specifies that the PROCESS permission is required when both upstream and downstream databases are TiDB clusters.
• Purpose of PROCESS Permission: This permission is necessary for sync-diff-inspector to query the INFORMATION_SCHEMA.CLUSTER_INFO table in TiDB environments.

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[gemini-code-assist]

Code Review

This PR updates the documentation to include the PROCESS privilege requirement for sync-diff-inspector. I've suggested a minor wording improvement for clarity, conciseness, and consistency with the surrounding text.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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