fix typo

[max8899]

prefered -> preferred

/sig multicluster

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[k8s-ci-robot]

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[perotinus]

@max8899 Thanks for your submission! I believe this needs to be fixed in the upstream brodocs project; please see my comment in #248.

[idealhack]

Closing in favor of https://github.com/Birdrock/brodocs/pull/6

/close