Improve code format consistency in docs

[seratch]

Summary

This pull request improves code format consistency in documentation and README. I used Visual Studio Code with the following settings.json:

{
  "editor.tabSize": 2,
  "editor.detectIndentation": false
}

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #356 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #356   +/-   ##
=====================================
  Coverage      73%    73%           
=====================================
  Files           7      7           
  Lines         500    500           
  Branches      146    146           
=====================================
  Hits          365    365           
  Misses        103    103           
  Partials       32     32

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