🌱 [release-0.15] Fix typo in charts README

[openshift-cherrypick-robot]

This is an automated cherry-pick of #664

/assign zhujian7

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@               Coverage Diff               @@
##             release-0.15     #665   +/-   ##
===============================================
  Coverage                ?   62.95%           
===============================================
  Files                   ?      182           
  Lines                   ?    17618           
  Branches                ?        0           
===============================================
  Hits                    ?    11091           
  Misses                  ?     5615           
  Partials                ?      912           

Flag	Coverage Δ
unit	62.95% <ø> (?)

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[zhujian7]

/lgtm
/approve

[zhujian7]

/assign @zhiweiyin318

[qiujian16]

/approve

[zhiweiyin318]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: openshift-cherrypick-robot, qiujian16, zhiweiyin318, zhujian7

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