Update 02_Filtering_&_Sorting/Chipotle/Exercises_with_solutions.ipynb (correct the step 9)

[UWzhuojiu]

Step 9: there are 4 orders which ordered canned soda more than one time, but only one can one time. (these four orders are orders whose order_id= 81,108,496,1396) So, if only counts the quantity will ignore these orders