Add several spelling corrections

[luzpaz]

No description provided.

[codecov-io]

Codecov Report

Merging #702 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #702   +/-   ##
=======================================
  Coverage   90.35%   90.35%           
=======================================
  Files           4        4           
  Lines         653      653           
  Branches       95       95           
=======================================
  Hits          590      590           
  Misses         46       46           
  Partials       17       17

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 85670dc...2162609. Read the comment docs.