Update the JavaDoc2

[BILLXYR]

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[codecov-io]

Codecov Report

Merging #171 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #171      +/-   ##
============================================
+ Coverage     42.26%   42.28%   +0.02%     
  Complexity      344      344              
============================================
  Files           103      103              
  Lines          1822     1821       -1     
  Branches        155      155              
============================================
  Hits            770      770              
+ Misses          997      996       -1     
  Partials         55       55              

Impacted Files	Coverage Δ	Complexity Δ
.../address/logic/commands/AddDescriptionCommand.java	54.16% <ø> (ø)	6.00 <0.00> (ø)
...eedu/address/logic/commands/AddExpenseCommand.java	70.00% <ø> (ø)	6.00 <0.00> (ø)
...ava/seedu/address/logic/commands/ClearCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...va/seedu/address/logic/commands/CommandResult.java	84.00% <ø> (ø)	10.00 <0.00> (ø)
...dress/logic/commands/DeleteDescriptionCommand.java	54.16% <ø> (ø)	6.00 <0.00> (ø)
...u/address/logic/commands/DeleteExpenseCommand.java	66.66% <ø> (ø)	6.00 <0.00> (ø)
.../seedu/address/logic/commands/ExchangeCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...java/seedu/address/logic/commands/ExitCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...java/seedu/address/logic/commands/HelpCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...s/logic/commands/ListExpenseByCategoryCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
... and 24 more

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