Prepare CLISyntax for module support

[ji-just-ji]

Add PREFIX_MODULE and PREFIX_SEMESTER to CLISyntax
Fix check errors in documentation

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (0dd42c1) 75.26% compared to head (b33c122) 75.29%.
Report is 7 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master      #77      +/-   ##
============================================
+ Coverage     75.26%   75.29%   +0.03%     
  Complexity      419      419              
============================================
  Files            71       71              
  Lines          1338     1340       +2     
  Branches        126      126              
============================================
+ Hits           1007     1009       +2     
  Misses          301      301              
  Partials         30       30              

Files	Coverage Δ
...ain/java/seedu/address/logic/parser/CliSyntax.java	87.50% <100.00%> (+4.16%)	⬆️

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[rocketninja7]

LGTM