Add several spelling corrections

[luzpaz]

No description provided.

[codecov-io]

Codecov Report

Merging #753 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #753   +/-   ##
=======================================
  Coverage   90.92%   90.92%           
=======================================
  Files           4        4           
  Lines         727      727           
  Branches      106      106           
=======================================
  Hits          661      661           
  Misses         48       48           
  Partials       18       18

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