Revert "Revert "[v8.5.6] docs: update sync-diff-inspector docs for mo…

[hfxsd]

…ve to ti…"

This reverts commit 682e353.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the TiDB Toolkit and sync-diff-inspector to reflect changes for TiDB v8.5.6 and later, specifically noting that tools are now available via TiUP and that sync-diff-inspector is included in the tiflow package. The review feedback provides several actionable suggestions to improve the conciseness and readability of the new content by simplifying version descriptions and removing redundant phrasing, ensuring the documentation adheres to the style guide.

[hfxsd]

/approve

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