docs: fix typos

[chansuke]

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While reading the code, i found some typos.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.27%. Comparing base (6b42617) to head (3d26b7b). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/argocd/git.go	0.00%	1 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1169   +/-   ##
=======================================
  Coverage   63.27%   63.27%           
=======================================
  Files          15       15           
  Lines        2358     2358           
=======================================
  Hits         1492     1492           
  Misses        771      771           
  Partials       95       95           

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