Update note about container_manager variable

[scila1996]

I was deploy my cluster with separate etcd cluster and not intersect with kube_control_plane or kube_node. And I want to run etcd cluster in docker but still used containerd to make container runtime for all other nodes. Therefore, I was added note to this doc for everyone.

What type of PR is this?

/kind documentation

Does this PR introduce a user-facing change?:

NONE

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[floryut]

@scila1996 could you please sign CLA ?

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, scila1996

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[scila1996]

@scila1996 could you please sign CLA ?

I was already signed to CNCF ! This is my first commit to this repo, please test again for me !

[floryut]

@scila1996 could you please sign CLA ?

I was already signed to CNCF ! This is my first commit to this repo, please test again for me !

Indeed all good, could you please rebase master though ? CI will not be happy before this is done :)

[oomichi]

/cc @oomichi

[oomichi]

A part of this line seems to come from docs/ansible.md.
It is necessary to change kube_node_ to kube_node, or kube_node_ to _kube_node_ and etcd to _etcd_ as the same as the original.

also please change same time to at the same time.

[oomichi]

It would be fine to merge this pull request as is at this time, and update those points later with another pull request.

/ok-to-test
/lgtm