Fix minor grammar in overview documentation page

[Vinaychinnu]

This PR fixes a small grammatical issue in the Kubernetes overview documentation.
No technical content has been changed.

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• ✅ login: Vinaychinnu / name: Vinay kumar Kombathula (95cf909, b7c6734)

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[stmcginnis]

Looks good. Since this is such a small fix, are there any other improvements you can make to this file while you are at it?

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 8a3ef6e45531e0bd7e0e5a5e7ccc04c3a922f910

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[Vinaychinnu]

Thanks for the suggestion. I have added additional grammar and consistency improvements to the file. Please let me know if any further changes are needed.