Geo: Add workaround tips for Unified URL case
What does this MR do?
From https://gitlab.slack.com/archives/C32LCGC1H/p1676306167199109:
I have a question about the behavior for authentication with Geo and multiple secondaries using unified url. When attempting to view a page under admin panel on a Secondary, after login (local login w/root account) we get redirected to the unified url, and presumably the primary. I am just wondering if this is expected? Is there a document that shows the route it takes for this request?
This MR adds workaround tips specifically for Unified URL. For "separate URLs", you can easily visit any secondary site via its external URL.
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