list calories command should specify that date field is optional

[nguyin]

list command can be a bit more specific to let user, inform the user that date field is optional.

[nus-pe-bot]

Team's Response

Pls refer to the UG as it does indeed mention.

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❓ Issue response

Team chose [response.Rejected]

• I disagree

Reason for disagreement: [replace this with your explanation]

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