dashboard: permissions for setting up SSO (#21837)

[ti-chi-bot]

This is an automated cherry-pick of #21837

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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 enhances the TiDB Dashboard documentation by clarifying the necessary permissions for configuring Single Sign-On (SSO). It explicitly states that the SYSTEM_VARIABLES_ADMIN permission is required to enable the SSO option, thereby preventing potential user confusion and streamlining the setup process for administrators. This change improves the clarity and completeness of the SSO configuration guide.

Highlights

• SSO Permission Clarification: Added a crucial note to the TiDB Dashboard SSO setup documentation, specifying that the Enable to use SSO when sign into TiDB Dashboard option requires SYSTEM_VARIABLES_ADMIN permission to be active.
• Documentation Link: Included a reference link to the TiDB Dashboard User Management documentation for more details on permissions.

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[gemini-code-assist]

Code Review

This pull request adds a note to the documentation regarding the necessary permissions for setting up Single Sign-On (SSO) on the TiDB Dashboard. My review focuses on enhancing the clarity and conciseness of this new note to ensure it is as helpful as possible for users, in accordance with the provided style guide. I have provided one suggestion to make the text more direct.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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