fix(helm/doc) - Add mutation flag to chart readme

[ritazh]

Signed-off-by: Rita Zhang rita.z.zhang@gmail.com

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
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[codecov-io]

Codecov Report

Merging #1236 (791bda9) into master (fe52bc9) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1236      +/-   ##
==========================================
- Coverage   49.96%   49.90%   -0.07%     
==========================================
  Files          64       64              
  Lines        4517     4517              
==========================================
- Hits         2257     2254       -3     
- Misses       1950     1953       +3     
  Partials      310      310              

Flag	Coverage Δ
unittests	49.90% <ø> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/readiness/object_tracker.go	80.97% <0.00%> (-1.64%)	⬇️

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