fix:inconsistent 'retries' document example fields in customrun

[cugykw]

Changes

The customrun example docs do not match.

  params:
    - name: searching
      value: the purpose of my existence
  #  customRef
  ref:
    apiVersion: custom.tekton.dev/v1alpha1

/kind documentation

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[cugykw]

/assign @abayer

[jerop]

@cugykw thanks for fixing the documentation, please update the commit message with more details

fix: inconsistent 'retries' document example fields in customrun

this change fixes the docs for using 'retries' in customruns from using 'ref' field to 'customref' field

cc @XinruZhang

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerop

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[XinruZhang]

Ops, thank you for the fix @cugykw!

/lgtm

[dibyom]

/ok-to-test