upgrade container by api

good afternoon, i am trying to test the rancher2.x api, but for those who are starting the doc it is very poor in detail, i am having difficulties, i would like to know what it would take to update the image of a container through the api.
I would like examples to better understand

Don’t use our API for this. Use the standard k8s one, which there is lots of tooling for.

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there would be something in the doc that would explain better how to do this, I’m new to this world of devops and I’m learning