tiflash: upgrade guide

[qiancai]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

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)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 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: tiflash: upgrade guide docs-cn#20128
• 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

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[gemini-code-assist]

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!

Summary of Changes

This pull request adds a new file named temp.md with the content "This is a test file.". The PR seems to be a basic addition of a markdown file, possibly for testing purposes or as a placeholder for future content.

Highlights

• File Creation: A new file, temp.md, has been created.
• Content Addition: The file temp.md contains the text "This is a test file."

Changelog

• temp.md
  • Created file temp.md
  • Added the line 'This is a test file.'

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---

A file is born,
A simple test it may be,
Future's seed is sown.

Footnotes

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[gemini-code-assist]

Code Review

The pull request introduces a new file temp.md with the content "This is a test file.". The change itself is simple, but it's important to consider the context and purpose of this file within the larger project.

Merge Readiness

The pull request introduces a new file. Given the limited scope and lack of identified issues, the pull request appears ready for merging, assuming it aligns with the project's overall goals and structure. However, I am unable to directly approve the pull request, and other reviewers should assess the file's purpose and integration within the project before merging.