Update scope structure in docs to match what is actually returned by the server

[kaypee90]

Summary

This PR addresses the previous discussion #2072

The documentation specifies that the scope returns headers of structure a list of lists but the actual implementation returns a list of tuples. This PR is to address that inconsistency.

Checklist

• [x] I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• [ ] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• [x] I've updated the documentation accordingly.

[Kludex]

The documentation is mentioning the request (client) sending to the server, so in any case, it's correct.

That said, to be more consistent with the rest of code examples, and the fact that we use tuples internally, I'll accept this.

Thanks @kaypee90 :)