Docs: fix example in object-curly-newline docs

[golopot]

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

[x] Documentation update
What changes did you make? (Give an overview)
Move an example from invalid to valid.

o = {a,
  b}
// This should pass `{consistent: true}`, but the docs say otherwise.

Is there anything you'd like reviewers to focus on?
No.

[not-an-aardvark]

Thanks for contributing!

[golopot]

Thanks for reviewing!