Fix typos with codespell

[cclauss]

I'm helping!

% codespell --ignore-words-list=unkown --skip="*.po" -w

• https://pypi.org/project/codespell

Checklist

• I have double-checked that there are no unrelated changes in this pull request (old patches, accidental config files, etc.)
• I have created at least one test case for the changes I have made
• I have updated the documentation for the changes I have made
• I have added my changes to the CHANGELOG.md

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Related issue(s)

Other Information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (560fa4a) 90.98% compared to head (0b683ef) 90.98%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #489   +/-   ##
=======================================
  Coverage   90.98%   90.98%           
=======================================
  Files          32       32           
  Lines         854      854           
  Branches      115      115           
=======================================
  Hits          777      777           
  Misses         56       56           
  Partials       21       21           

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