📚 DOCS: Update usage guide to use PyPI package name

[thibaudcolas]

It took me quite a few takes to realise markdown_it is the name of the Python module – the name of the package is markdown-it-py on PyPI. Hope this helps!

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Codecov Report

Merging #202 (1b1ef4d) into master (6649229) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #202   +/-   ##
=======================================
  Coverage   96.17%   96.17%           
=======================================
  Files          61       61           
  Lines        3213     3213           
=======================================
  Hits         3090     3090           
  Misses        123      123           

Flag	Coverage Δ
pytests	96.17% <ø> (ø)

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[chrisjsewell]

cheers

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