Missing behaviour documentation for add-member

[nus-pe-bot]

To replicate:

1. Run add-member CS2103T -cm #1

Expected: Like add-skill, will succeed (but not show) the adding of the duplicate person/skill Actual: Error

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_{[original: nus-cs2103-AY2324S2/pe-interim#5528] [original labels: type.DocumentationBug severity.VeryLow]}

[benson1029]

Team's Response

Thank you for your suggestion.

Duplicate status (if any):

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