Doc: use python 3 syntax for print

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Codecov Report

Merging #221 (cdfd87c) into master (e6f545f) will not change coverage.
The diff coverage is n/a.

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  Coverage   86.63%   86.63%           
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  Lines        4542     4542           
  Branches      659      659           
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  Hits         3935     3935           
  Misses        428      428           
  Partials      179      179           

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[jstasiak]

Thanks. Those tutorials are specifically for Python 2, but Python 2 support is deprecated so maybe they should be moved from tutorials/2.x to just tutorials and made Python 3-comptible; I'll get back to you on this.

[jstasiak]

There'll be a migration to Python 3-only codebase, so those tutorials will just be moved to the parent directory. Thank you for the contribution!