chore: fix prefixlistsids typo in readme

[1ms-ms]

Issue

Description

Fixing one more typo in docs, which has been omitted in #4187

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @1ms-ms. Thanks for your PR.

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[1ms-ms]

/retest

[k8s-ci-robot]

@1ms-ms: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[1ms-ms]

/check-cla

[zac-nixon]

/ok-to-test
/lgtm
/approved

[shuqz]

/approved

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 1ms-ms, shuqz
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