Update kubelet-config-file.md

[dgvigil]

Updated the link from v1alpha1 to v1beta1

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[mtaufen]

@dgvigil FYI there were a number of things that also needed to be updated, so I sent #7561. Thanks!

[mtaufen]

also noticed that the generated previews have FEATURE STATE: Kubernetes v1.9 at the top, when it should say FEATURE STATE: Kubernetes v1.10 for any docs changes for our next release...

Turns out this was because I was targeting the master branch instead of release-1.10 (still shows up as 1.9 in the preview, but this will be corrected in that branch).

[heckj]

@dgvigil if you haven't already, please sign the CLA so we can accept this update/patch. Is this specific to the release of 1.10, or relevant for the current version (v1.9)?

/assign

[mtaufen]

@heckj this is a dup of #7561, it can probably be closed (I don't have permissions).

[heckj]

closing as duplicate of #7561