Add several spelling corrections

[luzpaz]

No description provided.

[codecov-io]

Codecov Report

Merging #352 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #352   +/-   ##
=======================================
  Coverage   87.81%   87.81%           
=======================================
  Files           2        2           
  Lines         665      665           
  Branches       93       93           
=======================================
  Hits          584      584           
  Misses         62       62           
  Partials       19       19

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