chore(autoscaler): fix typo in Autoscaler interface comment

[kincoy]

What type of PR is this?

/kind cleanup
/sig autoscaling

What this PR does / why we need it:

This PR fixes a typo in the comment of the Autoscaler interface.
The comment for the method LastScaleDownDeleteTime() was incorrectly copied from LastScaleUpTime() and referenced "scale up" instead of "scale down".

Which issue(s) this PR fixes:

NONE

Special notes for your reviewer:

Just a minor cleanup to improve comment correctness and readability.

Does this PR introduce a user-facing change?

NONE

[linux-foundation-easycla]

• ✅login: kincoy / (ed6fc0f)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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[k8s-ci-robot]

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[elmiko]

/lgtm

[jackfrancis]

/ok-to-test
/release-note-none

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, kincoy

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