📚 DOCS: Fix docstring

[tsutsu3]

before:

after:

[tsutsu3]

Ref: actions/setup-python#171

[hukkin]

Maybe change pypy3 to pypy-3.6 or pypy-3.7 (or both) in CI as suggested in actions/setup-python#171 (comment) ? That seems like the better syntax to me. It wasn't used originally here because it didn't exist yet at the time.

[codecov]

Codecov Report

Merging #99 (6a4ede2) into master (f016794) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@ Coverage Diff @@ ## master #99 +/- ## ========================================== - Coverage 96.49% 96.49% -0.01%  ========================================== Files 69 69 Lines 2911 2910 -1 ========================================== - Hits 2809 2808 -1  Misses 102 102 

Flag	Coverage Δ
pytests	96.49% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
markdown_it/main.py	90.98% <ø> (ø)
markdown_it/helpers/parse_link_label.py	100.00% <0.00%> (ø)

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[tsutsu3]

Ref: actions/setup-python#171

It has been fixed to work with pypy3

[chrisjsewell]

cheers, note it won't actually show in the documentation site until #101 is fixed