Fixes Bug and updates DG and UG

[justinyjt]

• Fixes bug where commands that are not supposed to take in parameters get parsed and executed successfully even if parameters are included
• Updates UG to include review feature in coming soon
• Updates user stories in DG

[BrendonLau]

LGTM

[codecov-commenter]

Codecov Report

Merging #289 (414b7e9) into master (db55055) will increase coverage by 0.07%. The diff coverage is 80.00%.

@@             Coverage Diff              @@
##             master     #289      +/-   ##
============================================
+ Coverage     68.87%   68.95%   +0.07%     
- Complexity      705      709       +4     
============================================
  Files           107      107              
  Lines          2201     2216      +15     
  Branches        258      263       +5     
============================================
+ Hits           1516     1528      +12     
- Misses          601      603       +2     
- Partials         84       85       +1     

Impacted Files	Coverage Δ
...java/seedu/tinner/logic/commands/ClearCommand.java	100.00% <ø> (ø)
...ain/java/seedu/tinner/logic/parser/ParserUtil.java	91.54% <ø> (ø)
...a/seedu/tinner/logic/parser/CompanyListParser.java	92.30% <80.00%> (-7.70%)	:arrow_down:

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