README: use spec.runStrategy instead of spec.running

[jean-edouard]

Just a small README update

Release note:

NONE

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[openshift-ci]

@jean-edouard: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-gcp-common-templates-centos6	9144313	link	true	/test e2e-gcp-common-templates-centos6
ci/prow/e2e-gcp-common-templates-windows11	9144313	link	true	/test e2e-gcp-common-templates-windows11
ci/prow/e2e-gcp-common-templates-windows10	9144313	link	true	/test e2e-gcp-common-templates-windows10
ci/prow/e2e-gcp-common-templates-windows2022	9144313	link	true	/test e2e-gcp-common-templates-windows2022
ci/prow/e2e-gcp-common-templates-windows2016	9144313	link	true	/test e2e-gcp-common-templates-windows2016
ci/prow/e2e-gcp-common-templates-windows2019	9144313	link	true	/test e2e-gcp-common-templates-windows2019

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