[Document][doc] update auth center tenant and role

[mc123h]

Search before asking

• I had searched in the issues and found no similar document requirement.

Description

I need to add a new tenant, and I've also added a new role. However, the role cannot change the tenant, and the default tenant is "default". The official documentation does not cover this part.

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

Hello @, this issue has not been active for more than 30 days. This issue will be closed in 7 days if there is no response. If you have any questions, you can comment and reply.

你好 @, 这个 issue 30 天内没有活跃，7 天后将关闭，如需回复，可以评论回复。