Incorrect warning message for adding a person

[carriezhengjr]

The command add -p n/Bob e/bob@example.com p/98765432 i/interest test shows an error message to the phone number, but the phone number is actually valid. Hence, it does not align with the actual error which is the non-existing i/ flag in the App.

[nus-pe-script]

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