📖 Fix variable reference in docs

[vaibhavkhurana2018]

Fixes the reference of the struct var in the documentation as added in https://github.com/kubernetes-sigs/kubebuilder/pull/3613/files

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[phenixblue]

Thanks! This was a copy pasta mistake on my part. I had the decoder field exported in my type in my project, but it was not exported for the podAnnotator type in this example 🤦‍♂️

[camilamacedo86]

/lgtm
/ok-to-test
/approved

Thank you lot for getting this one

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, vaibhavkhurana2018

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