DM: add -archive to the URL of archived DM docs (#22890)

[ti-chi-bot]

This is an automated cherry-pick of #22890

First-time contributors' checklist

• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

Fix the broken DM links reported in #22867

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• 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: DM: add -archive to the URL of archived DM docs docs-cn#21639
• Other reference link(s):

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 documentation links for older TiDB Data Migration versions to point to the archived documentation site. The review feedback includes a suggestion to add a missing newline at the end of the release notes file for better tool compatibility and a recommendation to refactor a sentence in the upgrade guide to use the active voice and second person, ensuring compliance with the documentation style guide.

[qiancai]

/approve

[ti-chi-bot]

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