Fix and improve example for `overlay/insert`'s `via`#601

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mamachanko wants to merge 3 commits intocarvel-dev:developfrom

mamachanko:fix-insert-via-docs

Commits on Nov 28, 2022

fix example for inserting a ConfigMap into every Namespace
mamachanko
committed
conventionalize example for inserting ConfigMap into every Namespace
mamachanko
committed
emphasize affected Namespaces in overlay/insert via example
mamachanko
committed