Updated dg use cases

[coveralls]

Pull Request Test Coverage Report for Build 858

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 82.4%

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Files with Coverage Reduction	New Missed Lines	%
src/main/java/seedu/address/logic/commands/ClearApptsCommand.java	1	0.0%
<!--	Total:	1		-->

Totals
Change from base Build 855:	0.0%
Covered Lines:	2973
Relevant Lines:	3608

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💛 - Coveralls