📚 DOCS: Fix parameter-names and descriptions

[bugsbugsbux]

this corrects the docstrings of some of class Ruler's methods

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[chrisjsewell]

cheers!

[codecov]

Codecov Report

Merging #173 (488f8fd) into master (42e5732) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #173   +/-   ##
=======================================
  Coverage   96.08%   96.08%           
=======================================
  Files          60       60           
  Lines        3242     3242           
=======================================
  Hits         3115     3115           
  Misses        127      127           

Flag	Coverage Δ
pytests	96.08% <ø> (ø)

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Impacted Files	Coverage Δ
markdown_it/ruler.py	89.65% <ø> (ø)

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