Fix invalid image pull secret type

[molepigeon]

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Description

oc create secret image-registry isn't a valid command. The correct command to create an image pull secret is oc create secret docker-registry.

Any other comments?

There are other secret create commands in this topic that correctly use the docker-registry type.

See https://docs.openshift.com/container-platform/4.16/cli_reference/openshift_cli/developer-cli-commands.html#oc-create-secret-docker-registry

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[derekpoindexter]

Hi, thanks for the feedback! I've updated the steps.