Correct docs for a Cluster Selector case

[robinbraemer]

While browsing I found that an example in the Cluster Selector part of the userguide has a volatile mistake.

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[robinbraemer]

/assign @font

[RainbowMango]

Thanks, @robinbraemer !

/lgtm
And left approval to @font or @hectorj2f
/assign @hectorj2f

[hectorj2f]

/lgtm

[jimmidyson]

/approve

@robinbraemer Could you squash the commits please?

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jimmidyson, robinbraemer

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[hectorj2f]

/lgtm