Update doc around local development

[shavo007]

Related to this issue #1392

[googlebot]

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[codecov-io]

Codecov Report

Merging #1446 into master will decrease coverage by 0.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1446      +/-   ##
==========================================
- Coverage   44.53%   44.25%   -0.28%     
==========================================
  Files         112      112              
  Lines        4596     4634      +38     
==========================================
+ Hits         2047     2051       +4     
- Misses       2342     2375      +33     
- Partials      207      208       +1

Impacted Files	Coverage Δ
pkg/skaffold/watch/triggers.go	21.12% <0%> (-12.21%)	⬇️
pkg/skaffold/watch/watch.go	82.6% <0%> (-3.44%)	⬇️

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[shavo007]

I signed it!

[googlebot]

CLAs look good, thanks!

[container-tools-bot]

Please visit http://35.236.19.246:1313 to view changes to the docs.

[priyawadhwa]

Thanks for adding this, just had one comment!

[container-tools-bot]

Please visit http://35.235.81.81:1313 to view changes to the docs.

[shavo007]

👀 on above?

[priyawadhwa]

Thanks for your contribution!