fix some typos in the comments / examples

[patperu]

No description provided.

[codecov-io]

Codecov Report

Merging #60 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #60   +/-   ##
=======================================
  Coverage   54.41%   54.41%           
=======================================
  Files          89       89           
  Lines         748      748           
=======================================
  Hits          407      407           
  Misses        341      341

Impacted Files	Coverage Δ
R/deviation.R	100% <ø> (ø)	✅
R/truncate.R	0% <ø> (ø)	✅
R/intersect.R	100% <ø> (ø)	✅
R/union.R	100% <ø> (ø)	✅
R/erase.R	100% <ø> (ø)	✅

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[sckott]

thank so much @patperu !

[patperu]

Thank you for all the great packages 😄