Update kops_create_secret_dockerconfig.md

[integrii]

Today we were implementing an authenticated docker user, but it was unclear how exactly to do that. We learned that simply making this secret within kops was all that was needed for the docker config to start appearing on newly built nodes. It would be nice if the documentation here reflected that. It would have saved us some time.

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[hakman]

Thanks @integrii. Just a small suggestion from me. Please also squash the commits.

[olemarkus]

/ok-to-test

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[hakman]

/test all

[hakman]

/retest

[hakman]

/retest