Doc for GH 8946

For https://github.com/pydata/pandas/pull/8946
Does it make sense to drop the "to a scalar" part so that this line reads

> comparing equality (``==`` and ``!=``) to a list-like object (list, Series, array, ...) ...

It looks like the scalar part is covered in your 3rd case. I'm behind on the issue, so I could be missing something.