Docs: Fix configuration example in no-restricted-imports (fixes #11717)

[mdjermanovic]

What is the purpose of this pull request? (put an "X" next to item)

[X] Documentation update #11717

The following example from the no-restricted-imports documentation is an incorrect configuration:

"no-restricted-imports": ["error", [{
  "name": "import-foo",
  "message": "Please use import-bar instead."
}]]

Online Demo Link

Configuration should be either flat ["error", {}, {}, ...] or ["error", { paths: [{}, {}, ...] }].

It can't be ["error", [{}, {}, ...]], although this might a better choice than the flat array which looks a bit confusing.

What changes did you make? (Give an overview)

Fixed the example.

Is there anything you'd like reviewers to focus on?

The second example was correct, it's changed just for consistency.

[kaicataldo]

LGTM, thanks!