Fix typo in ptr.Deref doc comment

[aksh1618]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Bumped into this doing code read-throughs while learning about Go pointers, fixing for future readers!

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: aksh1618 / name: Aakarshit Uppal (40949e5)

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[skitt]

/lgtm

Thanks!

[skitt]

/assign @thockin

[thockin]

Thanks!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aksh1618, skitt, thockin

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