Add sftim as SIG Docs en approver

[sftim]

I was added as an en-localization owner for k/website in PR kubernetes/website#18398

This PR brings k/org up to parity

/sig docs

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sftim
To complete the pull request process, please assign jimangel
You can assign the PR to them by writing /assign @jimangel in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• config/kubernetes/sig-docs/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[zacharysarah]

Closing in favor of #1517.

/close

[k8s-ci-robot]

@zacharysarah: Closed this PR.

In response to this:

Closing in favor of #1517.

/close

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