fix minor typos

[shogo82148]

Issue #, if available:

Description of changes:

fix minor typos

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[codecov-commenter]

Codecov Report

Merging #324 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #324   +/-   ##
=======================================
  Coverage   72.23%   72.23%           
=======================================
  Files          18       18           
  Lines         724      724           
=======================================
  Hits          523      523           
  Misses        136      136           
  Partials       65       65           

Impacted Files	Coverage Δ
events/codebuild.go	44.44% <ø> (ø)
lambda/entry.go	75.00% <ø> (ø)
lambda/invoke_loop.go	72.00% <0.00%> (ø)

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