[SidecarContainer] provide sidecar best practices hints about exit code

[pegasas]

Description

This is a follow up from kubernetes/enhancements#753 (comment)

We need to improve the page https://kubernetes.io/docs/tutorials/configuration/pod-sidecar-containers/ with the best practices on how to implement sidecar containers. Things like exiting with 0 on SIGTERM

Issue

Closes: #47823

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[sftim]

If we want to document good practice, I'd put that elsewhere (not inside a tutorial page).

[pegasas]

If we want to document good practice, I'd put that elsewhere (not inside a tutorial page).

Any suggestions?
For me, I think this is a good place because it is near place which mentioned SIGTERM/SIGKILL fact.

[SergeyKanzhelev]

Let's add it to this page: https://kubernetes.io/docs/concepts/workloads/pods/sidecar-containers/#differences-from-application-containers

And link the differences section from where you put this node to originally