Layout/MultilineArrayLineBreaks tests missing

[mlwyatt]

The tests in multiline_array_line_breaks_spec.rb work perfectly when AllowMultilineFinalElement is true.
However, there's no test for when AllowMultilineFinalElement is false to trigger an offense for the code below, even though the docs list it as a "bad" example.

To be clear, when running rubocop against this code, it also works perfectly.

[a, b, foo(
  bar
)]

I didn't think an issue was appropriate for this since rubocop works fine and it's just the tests that fail.