Dev guide improvements

[andrey-kashcheev]

Fixing guide mistakes

Relates-To: DATASDK-99

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.32%. Comparing base (5d91790) to head (eb892af).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1705      +/-   ##
==========================================
- Coverage   80.34%   80.32%   -0.02%     
==========================================
  Files         356      356              
  Lines       14280    14281       +1     
  Branches     1562     1563       +1     
==========================================
- Hits        11473    11471       -2     
- Misses       2179     2180       +1     
- Partials      628      630       +2     

see 2 files with indirect coverage changes

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