Fix(typos) : fixing the spelling errors for the words kubernetes in readme.md and changelog.md

[NagurDiwakar]

What type of PR is this?

What this PR does / why we need it:

The minor spelling mistake over changelog and readme for kubernetes word

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

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: NagurDiwakar / name: Nagur Diwakar (46c7c5f)

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[yliaog]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: NagurDiwakar, yliaog

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[yliaog]

/release-note-none