Update token authentication file (#29139)

[sandipanpanda]

Fixed issue #29139.

https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet-tls-bootstrapping/#token-authentication-file says:

kube-apiserver has AN ability to accept tokens as authentication.

A better wording:

kube-apiserver has THE ability to accept tokens as authentication.

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[celestehorgan]

/lgtm
/approve

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 487180b812876bd50ae15398bf95641a7c6ae9bd