[PE-D] Error messages are slightly too general

[nus-pe-bot]

Error messages are currently shown for invalid commands, displaying the proper syntax as well as examples which is very helpful. It would really boost user experience if the specific error was mentioned.
e.g. The following command was entered: add n/ben chan p/1234 s/good school y/p1 v/home t/8 1000-1200 f/10 d/24/10/10
Result:

As seen in the above picture, it would be slightly better if the error message was that the day_of_week field was out of bounds.

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Labels: severity.Low type.FeatureFlaw
original: EkChinHui/ped#7

[ong-yinggao98]

day is handled with time so the error message should be the same