docs(crictl): add detailed explanations for ps command output columns

[lucming]

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Which issue(s) this PR fixes:

#1964

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[SergeyKanzhelev]

this makes it more confusing. If you refer to sandbox in POD ID, refer to sandbox here as well

[lucming]

here, POD just means pod name in k8s, there is absolutely no connection to the sandbox.

[saschagrunert]

@lucming please rebase to fixup the CI.