Why did Home Depot (.ca) try to sell me "Door Swings" with my fridge? What are they?
It is not a hardware item it is a service.  It is placed in the list of options needed or not, you simple decline.   As you see there are two items listed as optional installation some are needed some are not.  

It is used if the refrigerator door swings open the wrong way for your kitchen they will shift it to the other side.  In your case French doors are both directions so you simply decline.  Same as the haul away or relocation, if your install is new you have no unit to haul or remove so decline.  

The salesman should have informed you on both of these as to why and given a decision to decline.  Bad salesman not bad service as they are trying to prevent you from receiving the unit and then finding out after it is on site that doors swing incorrectly or you do not know what to do with the old unit.