Inconsistency in error output message for invalid command for add command and User guide

[nus-pe-bot]

As User Guide stated, the prefix p/ should be followed by PHONE_NUMBER while in the application itself it shows that the prefix p/ should be followed by PHONE. This confuses the user when trying to use this command. IT would be better if both UG and application can be consistent.

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_{[original: nus-cs2103-AY2425S1/pe-interim#3569] [original labels: severity.Low type.DocumentationBug]}

[psh12320]

Team's Response

Thank you for bringing this up. This is a valid bug.

Duplicate status (if any):

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