docs: replace v6.1 links with archive URLs (#23231)

[ti-chi-bot]

This is an automated cherry-pick of #23231

What is changed, added or deleted? (Required)

Replace remaining v6.1 live-doc links in the release notes with docs-archive URLs after the v6.1 archive.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s): docs: replace v6.1 links with archive URLs docs-cn#21782

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[gemini-code-assist]

Code Review

This pull request updates the documentation links in the release notes for TiDB v6.1 (across release-6.1.0.md through release-6.1.7.md) to point to the archived documentation domain (docs-archive.pingcap.com instead of docs.pingcap.com). There are no review comments, and I have no additional feedback to provide.

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[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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