[release-1.2] 📖 document how to manually test Runtime Extensions#7281

Merged

k8s-ci-robot merged 1 commit intokubernetes-sigs:release-1.2from k8s-infra-cherrypick-robot:cherry-pick-7270-to-release-1.2

Sep 25, 2022

+75-41

Commits on Sep 23, 2022

book: document how to manually test Runtime Extensions

sbueringer
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k8s-infra-cherrypick-robot
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