Fix docs for importing google_folder_iam_binding example

[red8888]

I wasted a little time on this and I think it would be easy to make it a little more obvious: https://www.terraform.io/docs/providers/google/r/google_folder_iam_binding.html

IAM binding imports use space-delimited identifiers; first the resource in question and then the role. These bindings can be imported using the folder and role, e.g.

$ terraform import google_folder_iam_binding.viewer "folder-name roles/viewer"

folder-name should be changed to folder-id and maybe an example?

I could not understand why this wasnt working:
$ terraform import google_folder_iam_binding.viewer "myfolder roles/viewer"
I needed to use the ID
$ terraform import google_folder_iam_binding.viewer "123456789012 roles/viewer"

[ghost]

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