Fix typo for the file name case type in GEP-2162 doc.

[bexxmodd]

What type of PR is this?
/kind cleanup
/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes the incorrect description of the naming convention used in the document. Described naming convention is kebab case but document says its pascal case.

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:
No

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: bexxmodd / name: Beka Modebadze (fcf98aa)

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[robscott]

Thanks @bexxmodd!

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bexxmodd, robscott

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[robscott]

/hold cancel
/release-note-none