doc:fix implementations.md typo

[uucloud]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Fix typo in the document.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

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• ✅ login: uucloud / name: uucloud (6bcabde)

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[shaneutt]

Thanks for the typo fix!

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: shaneutt, uucloud

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