v8.5.4: doc updates for v8.5.4

[qiancai]

What is changed, added or deleted? (Required)

This PR covers all doc updates for v8.5.4 that have been merge to the feature/preview-v8.5.4 branch.

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.

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• 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)
• v5.4 (TiDB 5.4 versions)

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

• This PR is translated from: Do not merge until v8.5.4: doc updates for v8.5.4 docs-cn#21061
• 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

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[gemini-code-assist]

Summary of Changes

Hello @qiancai, 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 focuses on preparing documentation updates intended for the "v8.5.4" release. It includes the addition of a new markdown file, "temp.md", which currently contains test content. The PR is explicitly marked to not be merged until the "v8.5.4" release, suggesting it's a preparatory or placeholder PR.

Highlights

• Documentation Updates: This pull request is dedicated to updating documentation content specifically for the upcoming "v8.5.4" release, as indicated by the PR title.
• New Test File Added: A new file named "temp.md" has been added, containing the placeholder text "This is a test file.".

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[gemini-code-assist]

Code Review

This pull request appears to be incorrect. While the title and description suggest documentation updates for v8.5.4, the only change is the addition of a temporary file named temp.md. This file seems to be a test file and does not align with the stated purpose of the PR. Please verify that the correct changes are included in this pull request before it is considered for merging. I have also added a minor comment on the added file.

[qiancai]

Close the PR created by mistake