🌱 Extend docs for patch.NewHelper

[guettli]

What this PR does / why we need it:

Extend docs for patch.NewHelper

It took me some time to understand why my first usage if the handy patch helper did not work.

You need to give NewHelper the original (unchanged) object.

I hope this PR makes it more obvious for the newcomer.

[k8s-ci-robot]

Hi @guettli. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[sbueringer]

Thx!!

/lgtm
/approve

/ok-to-test

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: bc26f552779cc7582d0ebbc9ac0cf894aa6c7657

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[killianmuldoon]

/area documentation