Update the role name (pingcap#22029)

Author: zhoubasten

tidb-cloud/tidb-cloud-org-sso-authentication.md

@@ -58,7 +58,7 @@ All the enabled authentication methods will be displayed on your custom TiDB Clo
 Auto-provision is a feature that allows members to automatically join an organization without requiring an invitation from the `Organization Owner` or `Project Owner`. In TiDB Cloud, it is disabled by default for all the supported authentication methods.
 
 - When auto-provision is disabled for an authentication method, only users who have been invited by an `Organization Owner` or `Project Owner` can log in to your custom URL.
-- When auto-provision is enabled for an authentication method, any users using this authentication method can log in to your custom URL. After login, they are automatically assigned the default **Member** role within the organization.
+- When auto-provision is enabled for an authentication method, any users using this authentication method can log in to your custom URL. After login, they are automatically assigned the default `Organization Viewer` role within the organization.
 
 For security considerations, if you choose to enable auto-provision, it is recommended to limit the allowed email domains for authentication when you [configure the authentication method details](#step-2-configure-authentication-methods).