small changes to kpt deployer docs and ordering

[felixtran39]

Related: #3904, #4689

Description
Small changes to comments and ordering to address comments left on #4689.

[yuwenma]

Thanks for the change! LGTMed

[codecov]

Codecov Report

Merging #4694 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4694   +/-   ##
=======================================
  Coverage   73.17%   73.17%           
=======================================
  Files         340      340           
  Lines       13372    13372           
=======================================
  Hits         9785     9785           
  Misses       2980     2980           
  Partials      607      607           

Impacted Files	Coverage Δ
pkg/skaffold/schema/latest/config.go	100.00% <ø> (ø)
pkg/skaffold/runner/new.go	67.54% <100.00%> (ø)

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