Fix the comments of the Name & Fix the msg of the etcd checker.

[wayilau]

This PR is a

• Feature Implementation
• Bug Fix
• Documentation

[k8s-ci-robot]

Hi @wayilau. Thanks for your PR.

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[jboyd01]

/ok-to-test

[jberkhahn]

Could you also add a comment for Check() ?

[wayilau]

Has been completed
@jberkhahn

[jboyd01]

/approved

[k8s-ci-robot]

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[wayilau]

/retest

[jberkhahn]

/lgtm