Incorrect placement of arrows in the sequence diagram of add command.

[jzwoo]

Issue: The arrows for activation bar of method call "containsSellerId(sellerID)" does not start and end at the start and end of the activation bar respectively. Thus, the sequence diagram is incorrect.

Screenshot 2020-11-13 at 1.44.00 PM

[nus-se-bot]

Your response not required for this bug as the team has accepted the bug as it is.