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!

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

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