code: func ExpandCustomizationSpec(d *schema.ResourceData, family string) types.CustomizationSpec {
  	obj := types.CustomizationSpec{
  		Identity:         expandBaseCustomizationIdentitySettings(d, family),
  		GlobalIPSettings: expandCustomizationGlobalIPSettings(d),
  		NicSettingMap:    expandSliceOfCustomizationAdapterMapping(d),
  	}
  	return obj
  }
docs: // ExpandCustomizationSpec reads certain ResourceData keys and
  // returns a CustomizationSpec.