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 providing important clarity regarding the permissions necessary to configure Single Sign-On (SSO). It specifically informs users that the SYSTEM_VARIABLES_ADMIN permission is a prerequisite for enabling the SSO option, thereby preventing potential confusion and streamlining the setup process for administrators.

Highlights

• SSO Permission Clarification: Added a crucial note to the TiDB Dashboard SSO documentation, specifying that the SYSTEM_VARIABLES_ADMIN permission is required for an account to enable the Single Sign-On feature.
• Documentation Enhancement: Improved the clarity of the SSO setup guide by linking 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 SSO configuration documentation, clarifying the necessary permissions to enable the feature. My review focuses on improving grammar and consistency according to the style guide. I've suggested a correction to a grammatical error in the new note.

[qiancai]

/approve

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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