Fix typos in comments and fields

[alexandear]

This PR corrects spelling mistakes.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.69%. Comparing base (1216c9b) to head (864ad52).
Report is 12 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1258      +/-   ##
==========================================
- Coverage   68.49%   66.69%   -1.81%     
==========================================
  Files          75       75              
  Lines        4384     5192     +808     
==========================================
+ Hits         3003     3463     +460     
- Misses       1233     1581     +348     
  Partials      148      148              

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