Retrieves a FormFieldPosition

curl --request GET \
  --url https://api.rootly.com/v1/form_field_positions/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "2c74f78c-f649-4569-903b-7f3a6e7b27d6",
    "type": "form_field_positions",
    "attributes": {
      "form_field_id": "17e9e0fa-ba97-4b1e-9f7a-41ca0145ac3a",
      "form": "web_update_incident_form",
      "position": 1
    }
  }
}