dashboard: Add note about prepared statements in Slow Query Detail (#22277)

[ti-chi-bot]

This is an automated cherry-pick of #22277

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• types: print argument as hex literal if non-printable tidb#65384

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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, 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 improves the clarity of the TiDB Dashboard documentation by adding specific details on how prepared statement arguments are presented in the Slow Query Detail view. This enhancement helps users better understand the full context of their slow queries, especially those involving prepared statements.

Highlights

• Documentation Update: Added a new note to the dashboard-slow-query.md file, clarifying how arguments for prepared statements are displayed within the Slow Query Detail section.

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Changelog

• dashboard/dashboard-slow-query.md
  • Added a note explaining the display format of arguments for prepared statements in the Slow Query Detail.

Activity

• This pull request is an automated cherry-pick of dashboard: Add note about prepared statements in Slow Query Detail #22277.
• The contributor has signed the Contributor License Agreement.
• The changes are marked to apply to the master, v9.0, and v8.5 branches.

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Code Review

The pull request adds a helpful note about how prepared statements and their arguments are displayed in the Slow Query Detail section of the TiDB Dashboard. The changes are technically accurate and improve the completeness of the documentation. The feedback provided focuses on adhering to the documentation style guide, specifically regarding the use of active voice and avoiding unnecessary word repetition to enhance clarity and flow.

[hfxsd]

Do not merge until the code PR pingcap/tidb#65510 is merged.