Update the review

[HCY123902]

Update the add review and delete review command and the documentation about the review command and book cover.

Resolves #212

[codecov-io]

Codecov Report

Merging #213 into master will decrease coverage by 0.15%.
The diff coverage is 14.75%.

@@             Coverage Diff              @@
##             master     #213      +/-   ##
============================================
- Coverage     47.33%   47.18%   -0.16%     
- Complexity      500      501       +1     
============================================
  Files           123      123              
  Lines          2406     2416      +10     
  Branches        319      321       +2     
============================================
+ Hits           1139     1140       +1     
- Misses         1187     1195       +8     
- Partials         80       81       +1     

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...seedu/address/logic/commands/AddReviewCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...du/address/logic/commands/DeleteReviewCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...dress/logic/parser/DeleteProblemCommandParser.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...in/java/seedu/address/logic/parser/ParserUtil.java	64.60% <0.00%> (-2.38%)	27.00 <0.00> (+1.00)	⬇️
...java/seedu/address/model/review/ReviewContent.java	66.66% <ø> (ø)	4.00 <0.00> (ø)
...c/main/java/seedu/address/ui/BookCoverManager.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
.../seedu/address/ui/LibraryBookDetailReviewCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...eedu/address/ui/LibraryBookDetailStockingCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...c/main/java/seedu/address/model/book/Stocking.java	60.00% <25.00%> (-4.29%)	5.00 <1.00> (ø)
... and 6 more

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