chore: clean-up perf optimization kep document

[abhisheksinghbaghel]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
cleaning up the kep document

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

Hi @abhisheksinghbaghel. Thanks for your PR.

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[andyzhangx]

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhisheksinghbaghel, andyzhangx

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• OWNERS [andyzhangx]

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