mistake: fix some typos

[i-pva]

fix some typos for lint

[codecov]

Codecov Report

Merging #141 (972dcd3) into master (53b3ab6) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #141   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           54        54           
  Lines         3669      3669           
=========================================
  Hits          3669      3669           

Impacted Files	Coverage Δ
changeset.go	100.00% <ø> (ø)
iterator.go	100.00% <ø> (ø)

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[Fs02]

Thanks