Update reference

Magstripe/README.md

@@ -17,14 +17,14 @@ Count # of set bits(1's) in column
 EVEN = 0 
 ODD = 1 
 
-Track 2 Debit/Credit Card Format(for example): 
+Track 2 Debit/Credit Card Format(for example, as I could not find actual magstripe access control cards): 
 ;1234567890123456=YYMMSSSDDDDDDDDDDDDDD?* 
 ; = Start Sentinel 
 1234567890123456 = 16 Digit Card # 
 = = End Card # 
 YY = Expiration Year 
 MM = Expiration Month 
-SSS = Service Code (As Understood From Wikipedia: "201" means chip required, "101" means no chip, be sure to recalculate the LRC if changing, it is not advised to experimental here without knowing the laws involved) 
+SSS = Service Code (As Understood From Wikipedia: "201" means chip required, "101" means no chip, be sure to recalculate the LRC if changing, it is not advised to experiment here without knowing the laws involved) 
 DDDDDDDDDDDDDD = Discretionary Data 
 ? = End Sentinel 
 *=LRC