Added descriptions for registered CLI aliases.

[jacobd91]

From the command line use "wp help" which will list the aliases and show the added descriptions

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 0.89%. Comparing base (6a7321d) to head (50defbc).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
Cli.php	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1039   +/-   ##
=========================================
  Coverage      0.89%    0.89%           
  Complexity    19795    19795           
=========================================
  Files           681      681           
  Lines        100155   100155           
=========================================
  Hits            893      893           
  Misses        99262    99262           

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