docs: Fix example to match https://github.com/openshift/api/pull/153

[rjhowe]

Fixing example command that extracts the current update image from the
ClusterVersion object to match chnages to the api openshift/api#153

[openshift-ci-robot]

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[openshift-ci-robot]

@rjhowe: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws	ed649db	link	/test e2e-aws
ci/prow/e2e-gcp-upgrade	ed649db	link	/test e2e-gcp-upgrade
ci/prow/e2e-upgrade	ed649db	link	/test e2e-upgrade
ci/prow/e2e	ed649db	link	/test e2e

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[openshift-merge-robot]

@rjhowe: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-agnostic-upgrade	ed649db	link	/test e2e-agnostic-upgrade
ci/prow/e2e-agnostic	ed649db	link	/test e2e-agnostic
ci/prow/e2e-agnostic-operator	ed649db	link	/test e2e-agnostic-operator

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[openshift-bot]

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/lifecycle stale

[openshift-bot]

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/lifecycle rotten
/remove-lifecycle stale

[openshift-bot]

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/close

[openshift-ci]

@rjhowe: PR needs rebase.

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[openshift-ci]

@openshift-bot: Closed this PR.

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