DOC: Replace gone pointer to "Usage" with "CLI Reference"

[yarikoptic]

• Closes Link to tutorial doesn't lead anywhere #810

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.48%. Comparing base (17fdfb4) to head (53adcef).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #811   +/-   ##
=======================================
  Coverage   82.48%   82.48%           
=======================================
  Files          42       42           
  Lines        4323     4323           
=======================================
  Hits         3566     3566           
  Misses        757      757           

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