Revise the logging cluster admin page

[tengqm]

This is a Bug Report

Problem:

Before "Sidecar container" becomes an officially supported, specialized type of Init-Container, the term has been used across the community for all auxiliary containers. One example is the techniques people used to collect logs.

With the term now gaining an official support, i.e. Init-Containers with "restartPolicy: Always", it is no longer appropriate to use the same terminology for other containers. For example the containers used for logging on page /docs/concepts/cluster-administration/logging.

Proposed Solution:

There are two options, at least:

• Revise the old pages to rename "sidecar" to something else, e.g. "auxiliary container", "utility container", "assistant container".
• Revise the old pages to correctly use sidecar containers. This means moving the logging containers into initContainers.

Page to Update:
https://kubernetes.io/docs/concepts/cluster-administration/logging/#sidecar-container-with-logging-agent

[k8s-ci-robot]

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[thisisharrsh]

/language en
/sig docs